diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 1d3cd010..c07c62eb 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -261,6 +261,8 @@ Lint/Void:
 # Configuration parameters: AllowedMethods, AllowedPatterns, IgnoredMethods, CountRepeatedAttributes.
 Metrics/AbcSize:
   Max: 143
+  Exclude:
+    - 'app/documents/group_order_invoice_pdf.rb'
 
 # Offense count: 17
 # Configuration parameters: CountComments, CountAsOne, ExcludedMethods, AllowedMethods, AllowedPatterns, IgnoredMethods, inherit_mode.
@@ -402,22 +404,16 @@ RSpec/BeforeAfterAll:
 # Configuration parameters: EnabledMethods.
 RSpec/Capybara/FeatureMethods:
   Exclude:
-    - "spec/integration/articles_spec.rb"
-    - "spec/integration/balancing_spec.rb"
-    - "spec/integration/config_spec.rb"
-    - "spec/integration/home_spec.rb"
-    - "spec/integration/login_spec.rb"
-    - "spec/integration/order_spec.rb"
-    - "spec/integration/product_distribution_example_spec.rb"
-    - "spec/integration/receive_spec.rb"
-    - "spec/integration/session_spec.rb"
-    - "spec/integration/supplier_spec.rb"
-
-# Offense count: 4
-RSpec/Capybara/SpecificMatcher:
-  Exclude:
-    - "spec/integration/login_spec.rb"
-    - "spec/integration/session_spec.rb"
+    - 'spec/integration/articles_spec.rb'
+    - 'spec/integration/balancing_spec.rb'
+    - 'spec/integration/config_spec.rb'
+    - 'spec/integration/login_spec.rb'
+    - 'spec/integration/order_spec.rb'
+    - 'spec/integration/product_distribution_example_spec.rb'
+    - 'spec/integration/receive_spec.rb'
+    - 'spec/integration/session_spec.rb'
+    - 'spec/integration/supplier_spec.rb'
+    - 'spec/integration/group_order_invoices_spec.rb'
 
 # Offense count: 27
 # Configuration parameters: Prefixes, AllowedPatterns.
diff --git a/app/assets/stylesheets/bootstrap_and_overrides.css.less b/app/assets/stylesheets/bootstrap_and_overrides.css.less
index 971308c9..ebd30b20 100644
--- a/app/assets/stylesheets/bootstrap_and_overrides.css.less
+++ b/app/assets/stylesheets/bootstrap_and_overrides.css.less
@@ -241,6 +241,9 @@ table {
   tr.order-article:hover .article-info {
     display: none;
   }
+  tr.order-article:focus .article-info {
+    display: none;
+  }
 }
 
 #order-footer {
@@ -275,11 +278,13 @@ tr.order-article .article-info {
   display: none;
 }
 
-tr.order-article:hover .article-info {
+tr.order-article:focus{
+  background-color: #E4EED6;
+}
+tr.order-article:focus .article-info {
   display: block;
 }
 
-
 // ********* Articles
 
 tr.just-updated {
diff --git a/app/controllers/concerns/send_group_order_invoice_pdf.rb b/app/controllers/concerns/send_group_order_invoice_pdf.rb
new file mode 100644
index 00000000..0e7ad08a
--- /dev/null
+++ b/app/controllers/concerns/send_group_order_invoice_pdf.rb
@@ -0,0 +1,13 @@
+module Concerns::SendGroupOrderInvoicePdf
+  extend ActiveSupport::Concern
+
+  protected
+
+  def send_group_order_invoice_pdf(group_order_invoice)
+    invoice_data = group_order_invoice.load_data_for_invoice
+    invoice_data[:title] = t('documents.group_order_invoice_pdf.title', supplier: invoice_data[:supplier])
+    invoice_data[:no_footer] = true
+    pdf = GroupOrderInvoicePdf.new invoice_data
+    send_data pdf.to_pdf, filename: pdf.filename, type: 'application/pdf'
+  end
+end
diff --git a/app/controllers/finance/balancing_controller.rb b/app/controllers/finance/balancing_controller.rb
index 4f23ac4f..c52be4b7 100644
--- a/app/controllers/finance/balancing_controller.rb
+++ b/app/controllers/finance/balancing_controller.rb
@@ -5,7 +5,7 @@ class Finance::BalancingController < Finance::BaseController
 
   def new
     @order = Order.find(params[:order_id])
-    flash.now.alert = t('finance.balancing.new.alert') if @order.closed?
+    flash.now.alert = t('finance.balancing.new.alert') if @order.closed? && flash[:alert].blank?
     @comments = @order.comments
 
     @articles = @order.order_articles.ordered_or_member.includes(:article, :article_price,
@@ -81,9 +81,24 @@ class Finance::BalancingController < Finance::BaseController
     @order = Order.find(params[:id])
     @type = FinancialTransactionType.find_by_id(params.permit(:type)[:type])
     @order.close!(@current_user, @type)
-    redirect_to finance_order_index_url, notice: t('finance.balancing.close.notice')
+    note = t('finance.balancing.close.notice')
+    if @order.closed?
+      alert = t('finance.balancing.close.alert')
+      if FoodsoftConfig[:group_order_invoices]&.[](:use_automatic_invoices)
+        @order.group_orders.each do |go|
+          alert = t('finance.balancing.close.settings_not_set')
+          goi = GroupOrderInvoice.find_or_create_by!(group_order_id: go.id)
+          if goi.save!
+            NotifyGroupOrderInvoiceJob.perform_later(goi)
+            note = t('finance.balancing.close.notice_mail')
+          end
+        end
+      end
+    end
+    alert ||= t('finance.balancing.close.alert')
+    redirect_to finance_order_index_url, notice: note
   rescue => error
-    redirect_to new_finance_order_url(order_id: @order.id), alert: t('finance.balancing.close.alert', message: error.message)
+    redirect_to new_finance_order_url(order_id: @order.id), notice: note, alert: alert, msg: error.message
   end
 
   # Close the order directly, without automaticly updating ordergroups account balances
diff --git a/app/controllers/group_order_invoices_controller.rb b/app/controllers/group_order_invoices_controller.rb
new file mode 100644
index 00000000..5fcca2d7
--- /dev/null
+++ b/app/controllers/group_order_invoices_controller.rb
@@ -0,0 +1,59 @@
+class GroupOrderInvoicesController < ApplicationController
+  include Concerns::SendGroupOrderInvoicePdf
+  before_action :authenticate_finance
+
+  def show
+    begin
+      @group_order_invoice = GroupOrderInvoice.find(params[:id])
+      if FoodsoftConfig[:contact][:tax_number]
+        respond_to do |format|
+          format.pdf do
+            send_group_order_invoice_pdf @group_order_invoice if FoodsoftConfig[:contact][:tax_number]
+          end
+        end
+      else
+        raise RecordInvalid
+      end
+    rescue ActiveRecord::RecordInvalid => error
+      redirect_back fallback_location: root_path, notice: 'Something went wrong', alert: I18n.t('errors.general_msg', msg: "#{error} " + I18n.t('errors.check_tax_number'))
+    end
+  end
+
+  def destroy
+    goi = GroupOrderInvoice.find(params[:id])
+    @order = goi.group_order.order
+    goi.destroy
+    respond_to do |format|
+      format.js
+      format.json { head :no_content }
+    end
+  end
+
+  def create_multiple
+    invoice_date = params[:group_order_invoice][:invoice_date]
+    order_id = params[:group_order_invoice][:order_id]
+    @order = Order.find(order_id)
+    gos = GroupOrder.where("order_id = ?", order_id)
+    gos.each do |go|
+      goi = GroupOrderInvoice.find_or_create_by!(group_order_id: go.id)
+      goi.invoice_date = invoice_date
+      goi.invoice_number = goi.generate_invoice_number(1)
+      goi.save!
+    end
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  def create
+    go = GroupOrder.find(params[:group_order])
+    @order = go.order
+    GroupOrderInvoice.find_or_create_by!(group_order_id: go.id)
+    respond_to do |format|
+      format.js
+    end
+    redirect_back fallback_location: root_path
+  rescue => error
+    redirect_back fallback_location: root_path, notice: 'Something went wrong', :alert => I18n.t('errors.general_msg', :msg => error)
+  end
+end
diff --git a/app/documents/group_order_invoice_pdf.rb b/app/documents/group_order_invoice_pdf.rb
new file mode 100644
index 00000000..aba39506
--- /dev/null
+++ b/app/documents/group_order_invoice_pdf.rb
@@ -0,0 +1,202 @@
+class GroupOrderInvoicePdf < RenderPDF
+  def filename
+    I18n.t('documents.group_order_invoice_pdf.filename', :number => @options[:invoice_number]) + '.pdf'
+  end
+
+  def title
+    I18n.t('documents.group_order_invoice_pdf.title', :supplier => @options[:supplier])
+  end
+
+  def body
+    contact = FoodsoftConfig[:contact].symbolize_keys
+    ordergroup = @options[:ordergroup]
+
+    # From paragraph
+    bounding_box [margin_box.right - 200, margin_box.top - 20], width: 200 do
+      text I18n.t('documents.group_order_invoice_pdf.invoicer')
+      move_down 7
+      text FoodsoftConfig[:name], size: fontsize(9), align: :left
+      move_down 5
+      text contact[:street], size: fontsize(9), align: :left
+      move_down 5
+      text "#{contact[:zip_code]} #{contact[:city]}", size: fontsize(9), align: :left
+      move_down 5
+      unless contact[:phone].blank?
+        text "#{Supplier.human_attribute_name :phone}: #{contact[:phone]}", size: fontsize(9), align: :left
+        move_down 5
+      end
+      unless contact[:email].blank?
+        text "#{Supplier.human_attribute_name :email}: #{contact[:email]}", size: fontsize(9), align: :left
+      end
+      move_down 5
+      text I18n.t('documents.group_order_invoice_pdf.tax_number', :number => @options[:tax_number]), size: fontsize(9), align: :left
+    end
+
+    # Receiving Ordergroup
+    bounding_box [margin_box.left, margin_box.top - 20], width: 200 do
+      text I18n.t('documents.group_order_invoice_pdf.invoicee')
+      move_down 7
+      text I18n.t('documents.group_order_invoice_pdf.ordergroup.name', ordergroup: ordergroup.name.to_s), size: fontsize(9)
+      move_down 5
+      if ordergroup.contact_address
+        text I18n.t('documents.group_order_invoice_pdf.ordergroup.contact_address', contact_address: ordergroup.contact_address.to_s), size: fontsize(9)
+        move_down 5
+      end
+      if ordergroup.contact_phone
+        text I18n.t('documents.group_order_invoice_pdf.ordergroup.contact_phone', contact_phone: ordergroup.contact_phone.to_s), size: fontsize(9)
+        move_down 5
+      end
+    end
+
+    # invoice Date and nnvoice number
+    bounding_box [margin_box.right - 200, margin_box.top - 150], width: 200 do
+      text I18n.t('documents.group_order_invoice_pdf.invoice_date', invoice_date: @options[:invoice_date].strftime(I18n.t('date.formats.default'))), align: :left
+      move_down 5
+      text I18n.t('documents.group_order_invoice_pdf.invoice_number', invoice_number: @options[:invoice_number]), align: :left
+    end
+
+    move_down 15
+
+    # kind of the "body" of the invoice
+    text I18n.t('documents.group_order_invoice_pdf.payment_method', payment_method: @options[:payment_method])
+    move_down 15
+    text I18n.t('documents.group_order_invoice_pdf.table_headline')
+    move_down 5
+
+    #------------- Table Data -----------------------
+
+    @group_order = GroupOrder.find(@options[:group_order].id)
+    if FoodsoftConfig[:group_order_invoices][:vat_exempt]
+      body_for_vat_exempt
+    else
+      body_with_vat
+    end
+  end
+  
+  def body_for_vat_exempt
+    total_gross = 0
+    data = [I18n.t('documents.group_order_invoice_pdf.vat_exempt_rows')]
+    move_down 10
+    group_order_articles = GroupOrderArticle.where(group_order_id: @group_order.id)
+    group_order_articles.each do |goa|
+      # if no unit is received, nothing is to be charged
+      next if goa.result.to_i == 0
+      goa_total_gross = goa.result * goa.order_article.price.gross_price
+      data << [goa.order_article.article.name,
+               goa.result.to_i,
+               number_to_currency(goa.order_article.price.gross_price),
+               number_to_currency(goa.total_price)]
+      total_gross += goa_total_gross
+    end
+
+    table data, position: :left, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      table.header = true
+      table.position = :center
+      table.cells.border_width = 1
+      table.cells.border_color = '666666'
+
+      table.row(0).column(1).width = 40
+      table.row(0).border_bottom_width = 2
+      table.columns(1).align = :right
+      table.columns(1..6).align = :right
+    end
+
+    move_down 5
+    sum = []
+    sum << [nil, nil, I18n.t('documents.group_order_invoice_pdf.sum_to_pay'), number_to_currency(total_gross)]
+    # table for sum
+    indent(200) do
+      table sum, position: :center, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+        sum.length.times do |count|
+          table.row(count).columns(0..3).borders = []
+        end
+        table.row(sum.length - 1).columns(0..2).borders = []
+        table.row(sum.length - 1).border_bottom_width = 2
+        table.row(sum.length - 1).columns(3).borders = [:bottom]
+      end
+    end
+
+    move_down 25
+    text I18n.t('documents.group_order_invoice_pdf.small_business_regulation')
+    move_down 10
+  end
+
+  def body_with_vat
+    total_gross = 0
+    total_net = 0
+    # Articles
+
+    tax_hash_net = Hash.new(0) # for summing up article net prices grouped into vat percentage
+    tax_hash_gross = Hash.new(0) # same here with gross prices
+
+    marge = FoodsoftConfig[:price_markup]
+
+    # data table looks different when price_markup > 0
+    data = if marge == 0
+             [I18n.t('documents.group_order_invoice_pdf.no_price_markup_rows')]
+           else
+             [I18n.t('documents.group_order_invoice_pdf.price_markup_rows', marge: marge)]
+           end
+    goa_tax_hash = GroupOrderArticle.where(group_order_id: @group_order.id).find_each.group_by { |oat| oat.order_article.price.tax }
+    goa_tax_hash.each do |tax, group_order_articles|
+      group_order_articles.each do |goa|
+        # if no unit is received, nothing is to be charged
+        next if goa.result.to_i == 0
+
+        order_article = goa.order_article
+        goa_total_net = goa.result * order_article.price.price
+        goa_total_gross = goa.result * order_article.price.gross_price
+        data << [order_article.article.name,
+                 goa.result.to_i,
+                 number_to_currency(order_article.price.price),
+                 number_to_currency(goa_total_net),
+                 tax.to_s + '%',
+                 number_to_currency(goa.total_price)]
+        tax_hash_net[tax.to_i] += goa_total_net
+        tax_hash_gross[tax.to_i] += goa_total_gross
+        total_net += goa_total_net
+        total_gross += goa_total_gross
+      end
+    end
+
+    # Two separate tables for sum and individual data
+    # article information + data
+    table data, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      table.header = true
+      table.position = :center
+      table.cells.border_width = 1
+      table.cells.border_color = '666666'
+
+      table.row(0).column(1).width = 40
+      table.row(0).border_bottom_width = 2
+      table.columns(1).align = :right
+      table.columns(1..6).align = :right
+    end
+
+    sum = []
+    sum << [nil, nil, nil, nil, I18n.t('documents.group_order_invoice_pdf.sum_to_pay_net'), number_to_currency(total_net)]
+    tax_hash_net.each_key.each do |tax|
+      sum << [nil, nil, nil, nil, I18n.t('documents.group_order_invoice_pdf.tax_included', tax: tax), number_to_currency(tax_hash_gross[tax] - tax_hash_net[tax])]
+    end
+    unless marge == 0
+      sum << [nil, nil, nil, nil, I18n.t('documents.group_order_invoice_pdf.markup_included', marge: marge), number_to_currency(total_gross * marge / 100.0)]
+    end
+    end_sum = total_gross * (1 + marge / 100.0)
+    sum << [nil, nil, nil, nil, I18n.t('documents.group_order_invoice_pdf.sum_to_pay_gross'), number_to_currency(end_sum)]
+    # table for sum
+    table sum, position: :right, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      sum.length.times do |count|
+        table.row(count).columns(0..5).borders = []
+      end
+      table.row(sum.length - 1).columns(0..4).borders = []
+      table.row(sum.length - 1).border_bottom_width = 2
+      table.row(sum.length - 1).columns(5).borders = [:bottom]
+    end
+
+    if(FoodsoftConfig[:group_order_invoices][:vat_exempt])
+      move_down 15
+      text I18n.t('documents.group_order_invoice_pdf.small_business_regulation')
+    end
+    move_down 10
+  end
+end
diff --git a/app/jobs/notify_group_order_invoice_job.rb b/app/jobs/notify_group_order_invoice_job.rb
new file mode 100644
index 00000000..1a17fe9a
--- /dev/null
+++ b/app/jobs/notify_group_order_invoice_job.rb
@@ -0,0 +1,10 @@
+class NotifyGroupOrderInvoiceJob < ApplicationJob
+  def perform(group_order_invoice)
+    ordergroup = group_order_invoice.group_order.ordergroup
+    ordergroup.users.each do |user|
+      Mailer.deliver_now_with_user_locale user do
+        Mailer.group_order_invoice(group_order_invoice, user)
+      end
+    end
+  end
+end
diff --git a/app/lib/render_pdf.rb b/app/lib/render_pdf.rb
index 479dc4a3..51dd4291 100644
--- a/app/lib/render_pdf.rb
+++ b/app/lib/render_pdf.rb
@@ -70,7 +70,7 @@ class RenderPdf < Prawn::Document
     options[:skip_page_creation] = true
     @options = options
     @first_page = true
-
+    no_footer = @options&.[](:no_footer) ? true : false
     super(options)
 
     # Use ttf for better utf-8 compability
@@ -84,11 +84,11 @@ class RenderPdf < Prawn::Document
     )
 
     header = options[:title] || title
-    footer = I18n.l(Time.now, format: :long)
+    footer = I18n.l(Time.now, format: :long) unless no_footer
 
     header_size = 0
     header_size = height_of(header, size: HEADER_FONT_SIZE, font: DEFAULT_FONT) + HEADER_SPACE if header
-    footer_size = height_of(footer, size: FOOTER_FONT_SIZE, font: DEFAULT_FONT) + FOOTER_SPACE
+    footer_size = no_footer ? 0 : height_of(footer, size: FOOTER_FONT_SIZE, font: DEFAULT_FONT) + FOOTER_SPACE 
 
     start_new_page(top_margin: TOP_MARGIN + header_size, bottom_margin: BOTTOM_MARGIN + footer_size)
 
@@ -98,12 +98,15 @@ class RenderPdf < Prawn::Document
       bounding_box [bounds.left, bounds.top + header_size], width: bounds.width, height: header_size do
         text header, size: HEADER_FONT_SIZE, align: :center, overflow: :shrink_to_fit if header
       end
-      font_size FOOTER_FONT_SIZE do
-        bounding_box [bounds.left, bounds.bottom - FOOTER_SPACE], width: bounds.width, height: footer_size do
-          text footer, align: :left, valign: :bottom
-        end
-        bounding_box [bounds.left, bounds.bottom - FOOTER_SPACE], width: bounds.width, height: footer_size do
-          text I18n.t('lib.render_pdf.page', number: page_number, count: page_count), align: :right, valign: :bottom
+
+      unless no_footer
+        font_size FOOTER_FONT_SIZE do
+          bounding_box [bounds.left, bounds.bottom - FOOTER_SPACE], width: bounds.width, height: footer_size do
+            text footer, align: :left, valign: :bottom
+          end 
+          bounding_box [bounds.left, bounds.bottom - FOOTER_SPACE], width: bounds.width, height: footer_size do
+            text I18n.t('lib.render_pdf.page', number: page_number, count: page_count), align: :right, valign: :bottom
+          end 
         end
       end
     end
diff --git a/app/mailers/mailer.rb b/app/mailers/mailer.rb
index 52e1354f..45ded3cb 100644
--- a/app/mailers/mailer.rb
+++ b/app/mailers/mailer.rb
@@ -51,6 +51,18 @@ class Mailer < ActionMailer::Base
          subject: I18n.t('mailer.welcome.subject')
   end
 
+  # Sends automatically generated invoicesfor group orders to ordergroup members
+  def group_order_invoice(group_order_invoice, user)
+    @user = user
+    @group_order_invoice = group_order_invoice
+    @group_order = group_order_invoice.group_order
+    @supplier = @group_order.order.supplier.name
+    @group = @group_order.ordergroup
+    add_group_order_invoice_attachments(group_order_invoice)
+    mail to: user,
+         subject: I18n.t('mailer.group_order_invoice.subject', group: @group.name, supplier: @supplier)
+  end
+
   # Sends order result for specific Ordergroup
   def order_result(user, group_order)
     @order        = group_order.order
@@ -168,6 +180,11 @@ class Mailer < ActionMailer::Base
     attachments['order.csv'] = OrderCsv.new(order, options).to_csv
   end
 
+  def add_group_order_invoice_attachments(group_order_invoice)
+    attachment_name = group_order_invoice.name + '.pdf'
+    attachments[attachment_name] = GroupOrderInvoicePdf.new(group_order_invoice.load_data_for_invoice).to_pdf
+  end
+
   # separate method to allow plugins to mess with the text
   def additonal_welcome_text(user)
   end
diff --git a/app/models/group_order.rb b/app/models/group_order.rb
index c789ef4e..3e74754c 100644
--- a/app/models/group_order.rb
+++ b/app/models/group_order.rb
@@ -9,6 +9,7 @@ class GroupOrder < ApplicationRecord
   has_many :group_order_articles, :dependent => :destroy
   has_many :order_articles, :through => :group_order_articles
   has_one :financial_transaction
+  has_one :group_order_invoice
   belongs_to :updated_by, optional: true, class_name: 'User', foreign_key: 'updated_by_user_id'
 
   validates_presence_of :order_id
diff --git a/app/models/group_order_invoice.rb b/app/models/group_order_invoice.rb
new file mode 100644
index 00000000..21557161
--- /dev/null
+++ b/app/models/group_order_invoice.rb
@@ -0,0 +1,58 @@
+class GroupOrderInvoice < ApplicationRecord
+  belongs_to :group_order
+  validates_presence_of :group_order
+  validates_uniqueness_of :invoice_number
+  validate :tax_number_set
+  after_initialize :init, unless: :persisted?
+
+  def generate_invoice_number(count)
+    trailing_number = count.to_s.rjust(4, '0')
+    if GroupOrderInvoice.find_by(invoice_number: self.invoice_date.strftime("%Y%m%d") + trailing_number)
+      generate_invoice_number(count.to_i + 1)
+    else
+      self.invoice_date.strftime("%Y%m%d") + trailing_number
+    end
+  end
+
+  def tax_number_set
+    if FoodsoftConfig[:contact][:tax_number].blank?
+      errors.add(:group_order_invoice, "Keine Steuernummer in FoodsoftConfig :contact gesetzt")
+    end
+  end
+
+  def init
+    self.invoice_date = Time.now unless invoice_date
+    self.invoice_number = generate_invoice_number(1) unless self.invoice_number
+    self.payment_method = FoodsoftConfig[:group_order_invoices]&.[](:payment_method) || I18n.t('activerecord.attributes.group_order_invoice.payment_method') unless self.payment_method
+  end
+
+  def name
+    I18n.t('activerecord.attributes.group_order_invoice.name') + "_#{invoice_number}"
+  end
+
+  def load_data_for_invoice
+    invoice_data = {}
+    order = group_order.order
+    invoice_data[:supplier] = order.supplier.name
+    invoice_data[:ordergroup] = group_order.ordergroup
+    invoice_data[:group_order] = group_order
+    invoice_data[:invoice_number] = invoice_number
+    invoice_data[:invoice_date] = invoice_date
+    invoice_data[:tax_number] = FoodsoftConfig[:contact][:tax_number]
+    invoice_data[:payment_method] = payment_method
+    invoice_data[:order_articles] = {}
+    group_order.order_articles.each do |order_article|
+      # Get the result of last time ordering, if possible
+      goa = group_order.group_order_articles.detect { |tmp_goa| tmp_goa.order_article_id == order_article.id }
+
+      # Build hash with relevant data
+      invoice_data[:order_articles][order_article.id] = {
+        :price => order_article.article.fc_price,
+        :quantity => (goa ? goa.quantity : 0),
+        :total_price => (goa ? goa.total_price : 0),
+        :tax => order_article.article.tax
+      }
+    end
+    invoice_data
+  end
+end
diff --git a/app/views/admin/configs/_tab_foodcoop.html.haml b/app/views/admin/configs/_tab_foodcoop.html.haml
index 5aea80c2..efea4d81 100644
--- a/app/views/admin/configs/_tab_foodcoop.html.haml
+++ b/app/views/admin/configs/_tab_foodcoop.html.haml
@@ -7,4 +7,5 @@
   = config_input c, :country, as: :string, input_html: {class: 'input-xlarge'}
   = config_input c, :email, required: true, input_html: {class: 'input-xlarge'}
   = config_input c, :phone, input_html: {class: 'input-medium'}
+  = config_input c, :tax_number, input_html: {class: 'input-medium'}
 = config_input form, :homepage, required: true, as: :url, input_html: {class: 'input-xlarge'}
diff --git a/app/views/admin/configs/_tab_payment.html.haml b/app/views/admin/configs/_tab_payment.html.haml
index 3fd7ca0a..70502c90 100644
--- a/app/views/admin/configs/_tab_payment.html.haml
+++ b/app/views/admin/configs/_tab_payment.html.haml
@@ -13,6 +13,11 @@
 = config_input form, :charge_members_manually, as: :boolean
 = config_input form, :use_iban, as: :boolean
 = config_input form, :use_self_service, as: :boolean
+%h4= t '.group_order_invoices'
+= form.fields_for :group_order_invoices do |field|
+  = config_input field, :use_automatic_invoices, as: :boolean
+  = config_input field, :vat_exempt, as: :boolean
+  = config_input field, :payment_method, as: :string, input_html: {class: 'input-medium'}
 
 %h4= t '.schedule_title'
 = form.simple_fields_for :order_schedule do |fields|
diff --git a/app/views/finance/balancing/_orders.html.haml b/app/views/finance/balancing/_orders.html.haml
index 3f20d850..dddb00c2 100644
--- a/app/views/finance/balancing/_orders.html.haml
+++ b/app/views/finance/balancing/_orders.html.haml
@@ -9,6 +9,8 @@
         %th= t('.end')
         %th= t('.state')
         %th= heading_helper Order, :updated_by
+        %th= heading_helper GroupOrderInvoice,  :name
+        %th
         %th
     %tbody
       - @orders.each do |order|
@@ -17,6 +19,14 @@
           %td=h format_time(order.ends) unless order.ends.nil?
           %td= order.closed? ? t('.cleared', amount: number_to_currency(order.foodcoop_result)) : t('.ended')
           %td= show_user(order.updated_by)
+          %td{id: "generate-invoice#{order.id}"}
+            - if order.closed?
+              -if FoodsoftConfig[:contact][:tax_number] && order.ordergroups.present?
+                = render :partial => 'group_order_invoices/links', locals:{order: order}
+              -else
+                = I18n.t('activerecord.attributes.group_order_invoice.tax_number_not_set')
+            - else
+              = t('orders.index.not_closed')
           %td
             - unless order.closed?
               - if current_user.role_orders?
diff --git a/app/views/finance/balancing/index.html.haml b/app/views/finance/balancing/index.html.haml
index 1d1fd8b5..0cfeccbd 100644
--- a/app/views/finance/balancing/index.html.haml
+++ b/app/views/finance/balancing/index.html.haml
@@ -1,5 +1,5 @@
 - title t('.title')
-
+- puts params
 - content_for :actionbar do
   - if FoodsoftConfig[:charge_members_manually]
     = link_to t('.close_all_direct_with_invoice'), close_all_direct_with_invoice_finance_order_index_path, method: :post, class: 'btn'
diff --git a/app/views/group_order_invoices/_links.html.haml b/app/views/group_order_invoices/_links.html.haml
new file mode 100644
index 00000000..34bd6271
--- /dev/null
+++ b/app/views/group_order_invoices/_links.html.haml
@@ -0,0 +1,25 @@
+.row
+  .column.small-12
+    - show_generate_with_date = true
+    - order.group_orders.each do |go|
+      - if go.group_order_invoice.present?
+        - show_generate_with_date = false
+    - if show_generate_with_date
+      = form_for :group_order_invoice, url: url_for('group_order_invoice#create_multiple'), remote: true do |f| 
+        = f.label :invoice_date, I18n.t('activerecord.attributes.group_order_invoice.links.invoice_date')
+        = f.date_field :invoice_date, {value: Date.today, max: Date.today, required: true}
+        = f.hidden_field :order_id, value: order.id
+        = f.submit  I18n.t('activerecord.attributes.group_order_invoice.links.generate_with_date'), class: 'btn btn small'
+
+- order.group_orders.includes([:group_order_invoice, :ordergroup]).each do |go|
+  .row
+    .column.small-3
+      = label_tag go.ordergroup.name
+    - if go.group_order_invoice
+      .column.small-3
+        = link_to I18n.t('activerecord.attributes.group_order_invoice.links.download'), group_order_invoice_path(go.group_order_invoice, :format => 'pdf'), class: 'btn btn-small'
+      .column.small-3
+        = link_to  I18n.t('activerecord.attributes.group_order_invoice.links.delete'), go.group_order_invoice, method: :delete, class: 'btn btn-danger btn-small', remote: true
+    - else
+      = button_to  I18n.t('activerecord.attributes.group_order_invoice.links.generate'), group_order_invoices_path(:method => :post, group_order: go) ,class: 'btn btn-small', params: {id: order.id}, remote: true
+
diff --git a/app/views/group_order_invoices/create.js.erb b/app/views/group_order_invoices/create.js.erb
new file mode 100644
index 00000000..5a43e85d
--- /dev/null
+++ b/app/views/group_order_invoices/create.js.erb
@@ -0,0 +1 @@
+$("#generate-invoice<%= params[:id] %>").html("<%= escape_javascript(render partial: 'links', locals: {order: @order}) %>");
diff --git a/app/views/group_order_invoices/create_multiple.js.erb b/app/views/group_order_invoices/create_multiple.js.erb
new file mode 100644
index 00000000..11ebbe45
--- /dev/null
+++ b/app/views/group_order_invoices/create_multiple.js.erb
@@ -0,0 +1 @@
+$("#generate-invoice<%= @order.id %>").html("<%= escape_javascript(render partial: 'links', locals: {order: @order}) %>");
diff --git a/app/views/group_order_invoices/destroy.js.erb b/app/views/group_order_invoices/destroy.js.erb
new file mode 100644
index 00000000..30ce5985
--- /dev/null
+++ b/app/views/group_order_invoices/destroy.js.erb
@@ -0,0 +1 @@
+$("#generate-invoice<%= @order.id %>").html("<%= escape_javascript(render partial: 'links', locals: {order: @order}) %>");
\ No newline at end of file
diff --git a/app/views/group_orders/_form.html.haml b/app/views/group_orders/_form.html.haml
index 3ffd583e..0cd27c76 100644
--- a/app/views/group_orders/_form.html.haml
+++ b/app/views/group_orders/_form.html.haml
@@ -69,7 +69,7 @@
   = f.hidden_field :order_id
   = f.hidden_field :updated_by_user_id
   = f.hidden_field :ordergroup_id
-  %table.table.table-hover
+  %table.table
     %thead
       %tr
         %th= heading_helper Article, :name
@@ -94,7 +94,7 @@
             %i.icon-tag
           %td{colspan: "9"}
         - order_articles.each do |order_article|
-          %tr{class: "#{cycle('even', 'odd', name: 'articles')} order-article #{get_missing_units_css_class(@ordering_data[:order_articles][order_article.id][:missing_units])}", valign: "top"}
+          %tr{class: "#{cycle('even', 'odd', name: 'articles')} order-article #{get_missing_units_css_class(@ordering_data[:order_articles][order_article.id][:missing_units])}", valign: "top", tabindex: "0"}
             %td.name= order_article.article.name
             - if @order.stockit?
               %td= truncate order_article.article.supplier.name, length: 15
diff --git a/app/views/mailer/group_order_invoice.text.haml b/app/views/mailer/group_order_invoice.text.haml
new file mode 100644
index 00000000..75948fbe
--- /dev/null
+++ b/app/views/mailer/group_order_invoice.text.haml
@@ -0,0 +1 @@
+= raw t '.text', group: @group.name, supplier: @supplier , foodcoop: FoodsoftConfig[:name]
diff --git a/config/locales/de.yml b/config/locales/de.yml
index 5a1a5b35..c42be657 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -90,6 +90,17 @@ de:
         tolerance: Toleranz
         total_price: Summe
         unit_price: Preis/Einheit
+      group_order_invoice:
+        name: Bestellgruppenrechnung
+        links:
+          delete: Rechnung löschen
+          download: Rechnung herunterladen
+          generate: Rechnung erzeugen
+          invoice_date: Datum der Bestellgruppenrechnung
+          generate_with_date: setzen & erzeugen
+
+        payment_method: Guthaben
+        tax_number_not_set: Steuernummer in den Einstellungen nicht gesetzt
       invoice:
         amount: Betrag
         attachment: Anhang
@@ -318,6 +329,7 @@ de:
         emails_title: E-Mails versenden
       tab_payment:
         schedule_title: Bestellschema
+        group_order_invoices: Bestellgruppenrechnungen
       tab_security:
         default_roles_title: Zugriff auf
         default_roles_paragraph: Jedes Mitglied der Foodcoop hat automatisch Zugriff auf folgende Bereiche.
@@ -602,6 +614,10 @@ de:
       email_from: E-Mails werden so aussehen, als ob sie von dieser Adresse gesendet wurden. Kann leer gelassen werden, um die Kontaktadresse der Foodcoop zu benutzen.
       email_replyto: Setze diese Adresse, wenn Du Antworten auf Foodsoft E-Mails auf eine andere, als die oben angegebene Absenderadresse bekommen möchtest.
       email_sender: E-Mails werden so aussehen, als ob sie von dieser Adresse versendet wurden. Um zu vermeiden, dass E-Mails dadurch als Spam eingeordnet werden, muss der Webserver möglicherweise im SPF Eintrag der Domain der E-Mail Adresse eingetragen werden.
+      group_order_invoices:
+        use_automativ_go_invoices: Es werden auf die Bestellgruppen zugeschnittene Rechnungen für die jeweilige Bestellung beim Klicken auf "abrechnen" an alle Bestellgruppenmitglieder per Mail versendet.
+        payment_method: Zahlungsart wird auf der Bestellgruppenrechnung deklariert
+        vat_exempt: Eine Auflistung der Rechnungsartikel erfolgt ohne explizite Ausweisung der MwSt. und die Rechnung erhält den notwendigen Zusatz bzgl. der Kleinunternehmerregelung §19 (FoodCoop Marge ebenfalls nicht in Rechnung enthalten)
       help_url: Link zur Dokumentationsseite
       homepage: Webseite der Foodcoop
       ignore_browser_locale: Ignoriere die Sprache des Computers des Anwenders, wenn der Anwender noch keine Sprache gewählt hat.
@@ -644,6 +660,7 @@ de:
         phone: Telefon
         street: Straße
         zip_code: Postleitzahl
+        tax_number: Steuernummer
       currency_space: Leerzeichen hinzufügen
       currency_unit: Währung
       custom_css: Angepasstes CSS
@@ -658,6 +675,10 @@ de:
       email_from: Absenderadresse
       email_replyto: Antwortadresse
       email_sender: Senderadresse
+      group_order_invoices:
+        use_automatic_invoices: Automatisch bei Abrechnung per Mail versenden
+        payment_method: Zahlungsart
+        vat_exempt: Diese Foodcoop ist MwSt. befreit
       help_url: URL Dokumentation
       homepage: Webseite
       ignore_browser_locale: Browsersprache ignorieren
@@ -743,6 +764,46 @@ de:
     update:
       notice: Lieferung wurde aktualisiert.
   documents:
+    group_order_invoice_pdf:
+      filename: Rechnung%{number}
+      invoicer: Rechnungsteller*in
+      invoicee: Rechnungsempfänger*in
+      invoice_date: 'Rechnungsdatum: %{invoice_date}'
+      invoice_number: 'Rechnungsnummer: %{invoice_number}'
+      markup_included: zzgl. Foodcoop Marge auf brutto Preis %{marge}%
+      ordergroup:
+        contact_phone: 'Telefonnummer: %{contact_phone}'
+        contact_address: 'Adresse :  %{contact_address}'
+        name: Bestellgruppe %{ordergroup}
+      payment_method: 'Zahlungsart: %{payment_method}'
+      sum_to_pay: Zu zahlen gesamt
+      sum_to_pay_net: Zu zahlen gesamt (netto)
+      sum_to_pay_gross: Zu zahlen gesamt (brutto)
+      small_business_regulation: Als Kleinunternehmer*in im Sinne von §19 Abs. 1 Umsatzsteuergesetz (UStG) wird keine Umsatzsteuer berechnet.
+      table_headline: 'Für die Bestellung fallen folgende Posten an:'
+      tax_excluded: exkl. MwSt.
+      tax_included: zzgl. Gesamtsumme MwSt. %{tax}%
+      tax_number: 'Steuernummer: %{number}'
+      title: Rechnung für die Bestellung bei %{supplier}
+      vat_exempt_rows:
+        - Name
+        - Anzahl
+        - Einzelpreis
+        - Artikel Gesamtpreis
+      no_price_markup_rows:
+        - Name
+        - Anzahl
+        - Einzelpreis (netto)
+        - Artikel Gesamtpreis (netto)
+        - MwSt.
+        - Artikel Gesamtpreis (brutto)
+      price_markup_rows:
+        - Name
+        - Anzahl
+        - Einzelpreis (netto)
+        - Artikel Gesamtpreis (netto)
+        - MwSt.
+        - Artikel Gesamtpreis (brutto) inkl. Foodcoopmarge %{marge}%
     order_by_articles:
       filename: Bestellung %{name}-%{date} - Artikelsortierung
       title: 'Artikelsortierung der Bestellung: %{name}, beendet am %{date}'
@@ -766,6 +827,7 @@ de:
       heading: Artikelübersicht (%{count})
       title: 'Sortiermatrix der Bestellung: %{name}, beendet am %{date}'
   errors:
+    check_tax_number: Überprüft, ob die Steuernummer der Foodcoop richtig gesetzt ist
     general: Ein Problem ist aufgetreten.
     general_again: Ein Fehler ist aufgetreten. Bitte erneut versuchen.
     general_msg: 'Ein Fehler ist aufgetreten: %{msg}'
@@ -789,6 +851,8 @@ de:
       close:
         alert: 'Ein Fehler ist beim Abrechnen aufgetreten: %{message}'
         notice: Bestellung wurde erfolgreich abgerechnet, die Kontostände aktualisiert.
+        notice_mail: Bestellung wurde erfolgreich abgerechnet, die Kontostände aktualisiert. Außerdem wurden automatisch Rechnungen an die Bestellgruppenmitglieder geschickt.
+        settings_not_set: Keine Emails mit Bestellgruppenrechnungen versendet. Bitte überprüfe die Einstellungen. Steuernummer gesetzt?
       close_all_direct_with_invoice:
         notice: 'Es wurden %{count} Bestellung abgerechnet.'
       close_direct:
@@ -853,6 +917,7 @@ de:
         ended: beendet
         name: Lieferantin
         no_closed_orders: Derzeit gibt es keine beendeten Bestellungen.
+
         state: Status
       summary:
         changed: Daten wurden verändert!
@@ -1264,6 +1329,15 @@ de:
     feedback:
       header: "%{user} schrieb am %{date}:"
       subject: Feedback zur Foodsoft
+    group_order_invoice:
+      subject: Bestellgruppenrechnung für %{group} bei %{supplier}
+      text: |
+        Liebe Bestellgruppe %{group},
+
+        Die Sammelbestellung bei %{supplier} wurde soeben abgerechnet und für die jeweiligen Bestellgruppen Rechnungen angelegt.
+        Im Anhang befindet sich daher eure Rechnung.
+
+        Viele Grüße von %{foodcoop}
     invite:
       subject: Einladung in die Foodcoop
       text: |
@@ -1496,6 +1570,7 @@ de:
       orders_finished: Beendet
       orders_open: Laufend
       orders_settled: Abgerechnet
+      not_closed: Bestellung noch nicht abgerechnet
       title: Bestellungen verwalten
     model:
       close_direct_message: Die Bestellung wurde abgechlossen, ohne die Mitgliederkonten zu belasten.
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 59e94385..4699a7ca 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -90,6 +90,16 @@ en:
         tolerance: Tolerance
         total_price: Sum
         unit_price: Price/Unit
+      group_order_invoice:
+        name: Group order invoice
+        links:
+          delete: delete invoice
+          download: download invoice
+          invoice_date: date of group order invoice
+          generate: generate invoice
+          generate_with_date: set & generate
+        payment_method: Credit
+        tax_number_not_set: Tax number not set in configs
       invoice:
         amount: Amount
         attachment: Attachment
@@ -318,6 +328,7 @@ en:
         emails_title: Sending email
       tab_payment:
         schedule_title: Ordering schedule
+        group_order_invoices:         Group order invoices
       tab_security:
         default_roles_title: Access to
         default_roles_paragraph: By default every member of the foodcoop has access to the following areas.
@@ -603,6 +614,9 @@ en:
       email_from: Emails will appear to be from this email address. Leave empty to use the foodcoop's contact address.
       email_replyto: Set this when you want to receive replies from emails sent by Foodsoft on a different address than the above.
       email_sender: Emails will appear to be sent from this email address. To avoid emails sent being classified as spam, the webserver may need to be registered in the SPF record of the email address's domain.
+      use_automatic_invoices: A listing of the invoice items is made without explicit display of VAT and the invoice receives the necessary addition regarding the small business regulation §19 (applies to Germany)
+      payment_method: Payment type is declared on the order group invoice
+      vat_exempt: A listing of the invoice items is made without explicit  display of VAT and the invoice contains the necessary addition regarding the German Kleinunternehmerregelung §19 UStG (attention! FoodCoop marge not included in nvoice).
       help_url: Documentation website.
       homepage: Website of your foodcoop.
       ignore_browser_locale: Ignore the language of user's computer when the user has not chosen a language yet.
@@ -630,6 +644,8 @@ en:
       tolerance_is_costly: Order as much of the member tolerance as possible (compared to only as much needed to fill the last box). Enabling this also includes the tolerance in the total price of the open member order.
       distribution_strategy: How articles should be distributed after an order has been received.
       use_apple_points: When the apple point system is enabled, members are required to do some tasks to be able to keep ordering.
+      use_automatic_invoices: When an order is settled, invoices for the individual order groups are automatically sent by mail
+      payment_method: Payment Method for group order invoices
       use_boxfill: When enabled, near end of an order, members are only able to change their order when increases the total amount ordered. This helps to fill any remaining boxes. You still need to set a box-fill date for the orders.
       use_iban: When enabled, supplier and user provide an additonal field for storing the international bank account number.
       use_nick: Show and use nicknames instead of real names. When enabling this, please check that each user has a nickname.
@@ -645,6 +661,7 @@ en:
         phone: Phone
         street: Street
         zip_code: Postcode
+        tax_number: Tax number
       currency_space: add space
       currency_unit: Currency
       custom_css: Custom CSS
@@ -688,6 +705,10 @@ en:
         first_order_first_serve: First distribute to those who ordered first
         no_automatic_distribution: No automatic distribution
       use_apple_points: Apple points
+      group_order_invoices:
+        use_automatic_invoices: Send automatically via mail after oder settlement
+        payment_method: Payment method
+        vat_exempt: This foodcoopis VAT exempt
       use_boxfill: Box-fill phase
       use_iban: Use IBAN
       use_nick: Use nicknames
@@ -745,6 +766,46 @@ en:
     update:
       notice: Delivery was updated.
   documents:
+    group_order_invoice_pdf:
+      ordergroup:
+        contact_phone: 'Phone: %{contact_phone}'
+        contact_address: 'Adress :  %{contact_address}'
+        name: 'Ordergroup: %{ordergroup}'
+      filename: Invoice%{number}
+      invoicee: Invoicee
+      invoicer: Invoicer
+      invoice_date: 'Invoice date: %{invoice_date}'
+      invoice_number: 'Invoice number: %{invoice_number}'
+      markup_included: incl Foodcoop Marge on gross price %{marge}%
+      payment_method: 'Payment_method: %{payment_method}'
+      small_business_regulation: As a small entrepreneur in the sense of §19 para. 1 of the Umsatzsteuergesetz (UStG), no value added tax is charged.
+      sum_to_pay: Total sum
+      sum_to_pay_net: Total sum (net)
+      sum_to_pay_gross: Total sum (gross)
+      table_headline: 'The following items will be charged for the order:'
+      tax_excluded: excl. MwSt.
+      tax_included: incl. VAT %{tax}%
+      tax_number: 'Tax number: %{number}'
+      title: Invoice for order at %{supplier}
+      vat_exempt_rows:
+        - Name
+        - Quantity
+        - Unit price
+        - Total price
+      no_price_markup_rows:
+        - Name
+        - Quantity
+        - Unit price (net)
+        - Total price (net)
+        - VAT
+        - Total price (gross)
+      price_markup_rows:
+        - Name
+        - Quantity
+        - Unit price (net)
+        - Total price (net)
+        - VAT
+        - Total price (gross) incl. foodcoop margin
     order_by_articles:
       filename: Order %{name}-%{date} - by articles
       title: 'Order sorted by articles: %{name}, closed at %{date}'
@@ -768,6 +829,7 @@ en:
       heading: Article overview (%{count})
       title: 'Order sorting matrix: %{name}, closed at %{date}'
   errors:
+    check_tax_number: Please check whether the foodcoop's tax number is set correctly.
     general: A problem has occured.
     general_again: A problem has occured. Please try again.
     general_msg: 'A problem has occured: %{msg}'
@@ -791,6 +853,7 @@ en:
       close:
         alert: 'An error occured while accounting: %{message}'
         notice: Order was settled succesfully, the balance of the account was updated.
+        settings_not_set: No emails with order group invoices sent. Please check the settings. Tax number set?
       close_all_direct_with_invoice:
         notice: '%{count} orders have been settled.'
       close_direct:
@@ -1268,6 +1331,15 @@ en:
     feedback:
       header: "%{user} wrote at %{date}:"
       subject: Feedback for Foodsoft
+    group_order_invoice:
+      subject: Order group invoice for %{group} at %{supplier}
+      text: |
+        Dear order group %{group},
+
+        The collective order at %{supplier} has just been settled and invoices have been created for the respective order groups.
+        Attached you will find your invoice.
+
+        Best regards from %{foodcoop}
     from_via_foodsoft: "%{name} via Foodsoft"
     invite:
       subject: Invitation to the Foodcoop
@@ -1507,6 +1579,7 @@ en:
       orders_finished: Closed
       orders_open: Open
       orders_settled: Settled
+      not_closed: Order not yet settled
       title: Manage orders
     model:
       close_direct_message: Order settled without charging member accounts.
diff --git a/config/routes.rb b/config/routes.rb
index 83e65707..9b98f17a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -142,10 +142,14 @@ Rails.application.routes.draw do
       end
     end
 
+
+    post 'finance/group_order_invoice', to: 'group_order_invoices#create_multiple'
+    resources :group_order_invoices
+    
     resources :article_categories
-
+    
     ########### Finance
-
+    
     namespace :finance do
       root to: 'base#index'
 
@@ -174,6 +178,7 @@ Rails.application.routes.draw do
         get :unpaid, on: :collection
       end
 
+
       resources :links, controller: 'financial_links', only: [:create, :show] do
         collection do
           get :incomplete
diff --git a/db/migrate/20211208142719_create_group_order_invoices.rb b/db/migrate/20211208142719_create_group_order_invoices.rb
new file mode 100644
index 00000000..b0aa13f7
--- /dev/null
+++ b/db/migrate/20211208142719_create_group_order_invoices.rb
@@ -0,0 +1,13 @@
+class CreateGroupOrderInvoices < ActiveRecord::Migration[5.2]
+  def change
+    create_table :group_order_invoices do |t|
+      t.integer :group_order_id
+      t.bigint :invoice_number, unique: true, limit: 8
+      t.date :invoice_date
+      t.string :payment_method
+
+      t.timestamps
+    end
+    add_index :group_order_invoices, :group_order_id, unique: true
+  end
+end
diff --git a/spec/factories/group_order_invoice.rb b/spec/factories/group_order_invoice.rb
new file mode 100644
index 00000000..89723873
--- /dev/null
+++ b/spec/factories/group_order_invoice.rb
@@ -0,0 +1,7 @@
+require 'factory_bot'
+
+FactoryBot.define do
+  factory :group_order_invoice do
+    group_order { create :group_order }
+  end
+end
diff --git a/spec/integration/group_order_invoices_spec.rb b/spec/integration/group_order_invoices_spec.rb
new file mode 100644
index 00000000..a84d9bc7
--- /dev/null
+++ b/spec/integration/group_order_invoices_spec.rb
@@ -0,0 +1,71 @@
+require_relative '../spec_helper'
+
+feature GroupOrderInvoice, js: true do
+  let(:admin) { create :user, groups: [create(:workgroup, role_finance: true)] }
+  let(:user) { create :user, groups: [create(:ordergroup)] }
+  let(:article) { create :article, unit_quantity: 1 }
+  let(:order) { create :order, supplier: article.supplier, article_ids: [article.id], ends: Time.now } # need to ref article
+  let(:go) { create :group_order, order: order, ordergroup: user.ordergroup}
+  let(:oa) { order.order_articles.find_by_article_id(article.id) }
+  let(:ftt) { create :financial_transaction_type }
+  let(:goa) { create :group_order_article, group_order: go, order_article: oa }
+
+  include ActiveJob::TestHelper
+
+  before { login admin }
+
+  after { clear_enqueued_jobs }
+
+  it 'does not enqueue MailerJob when order is settled if tax_number or options not set' do
+    goa.update_quantities 2, 0
+    oa.update_results!
+    visit confirm_finance_order_path(id: order.id)
+    click_link_or_button I18n.t('finance.balancing.confirm.clear')
+    expect(NotifyGroupOrderInvoiceJob).not_to have_been_enqueued
+  end
+
+  it 'enqueues MailerJob when order is settled if tax_number or options are set' do
+    goa.update_quantities 2, 0
+    oa.update_results!
+    order.reload
+    FoodsoftConfig[:group_order_invoices] = { use_automatic_invoices: true }
+    FoodsoftConfig[:contact][:tax_number] = 12_345_678
+    visit confirm_finance_order_path(id: order.id, type: ftt)
+    expect(page).to have_selector(:link_or_button, I18n.t('finance.balancing.confirm.clear'))
+    click_link_or_button I18n.t('finance.balancing.confirm.clear')
+    expect(NotifyGroupOrderInvoiceJob).to have_been_enqueued
+  end
+  
+  it 'generates Group Order Invoice when order is closed if tax_number is set' do
+    goa.update_quantities 2, 0
+    oa.update_results!
+    FoodsoftConfig[:contact][:tax_number] = 12_345_678
+    order.update!(state: 'closed')
+    order.reload
+    visit finance_order_index_path
+    expect(page).to have_selector(:link_or_button, I18n.t('activerecord.attributes.group_order_invoice.links.generate'))
+    click_link_or_button I18n.t('activerecord.attributes.group_order_invoice.links.generate')
+    expect(GroupOrderInvoice.all.count).to eq(1)
+  end
+    
+  it 'generates multiple Group Order Invoice for order when order is closed if tax_number is set' do
+    goa.update_quantities 2, 0
+    oa.update_results!
+    FoodsoftConfig[:contact][:tax_number] = 12_345_678
+    order.update!(state: 'closed')
+    order.reload
+    visit finance_order_index_path
+    expect(page).to have_selector(:link_or_button, I18n.t('activerecord.attributes.group_order_invoice.links.generate_with_date'))
+    click_link_or_button I18n.t('activerecord.attributes.group_order_invoice.links.generate_with_date')
+    expect(GroupOrderInvoice.all.count).to eq(1)
+  end
+
+  it 'does not generate Group Order Invoice when order is closed if tax_number not set' do
+    goa.update_quantities 2, 0
+    oa.update_results!
+    order.update!(state: 'closed')
+    order.reload
+    visit finance_order_index_path
+    expect(page).to have_content(I18n.t('activerecord.attributes.group_order_invoice.tax_number_not_set'))
+  end
+end
diff --git a/spec/models/group_order_invoice_spec.rb b/spec/models/group_order_invoice_spec.rb
new file mode 100644
index 00000000..24bfcf7e
--- /dev/null
+++ b/spec/models/group_order_invoice_spec.rb
@@ -0,0 +1,59 @@
+require_relative '../spec_helper'
+
+describe GroupOrderInvoice do
+  let(:user) { create :user, groups: [create(:ordergroup)] }
+  let(:supplier) { create :supplier }
+  let(:article) { create :article, supplier: supplier }
+  let(:order) { create :order }
+  let(:group_order) { create :group_order, order: order, ordergroup: user.ordergroup }
+
+  describe 'erroneous group order invoice' do
+    let(:goi) { create :group_order_invoice, group_order_id: group_order.id }
+    it 'does not create group order invoice if tax_number not set' do
+      expect { goi }.to raise_error(ActiveRecord::RecordInvalid, /.*/)
+    end
+  end
+
+  describe 'valid group order invoice' do
+    before do
+      FoodsoftConfig[:contact][:tax_number] = 123_457_8
+    end
+
+    invoice_number1 = Time.now.strftime("%Y%m%d") + '0001'
+    invoice_number2 = Time.now.strftime("%Y%m%d") + '0002'
+
+    let(:user2) { create :user, groups: [create(:ordergroup)] }
+
+    let(:goi1) { create :group_order_invoice, group_order_id: group_order.id }
+    let(:goi2) { create :group_order_invoice, group_order_id: group_order.id }
+
+    let(:group_order2) { create :group_order, order: order, ordergroup: user2.ordergroup }
+
+    let(:goi3) { create :group_order_invoice, group_order_id: group_order2.id }
+    let(:goi4) { create :group_order_invoice, group_order_id: group_order2.id, invoice_number: invoice_number1 }
+
+    it 'creates group order invoice if tax_number is set' do
+      expect(goi1).to be_valid
+    end
+
+    it 'sets invoice_number according to date' do
+      number = Time.now.strftime("%Y%m%d") + '0001'
+      expect(goi1.invoice_number).to eq(number.to_i)
+    end
+
+    it 'fails to create if group_order_id is used multiple times for creation' do
+      expect(goi1.group_order.id).to eq(group_order.id)
+      expect { goi2 }.to raise_error(ActiveRecord::RecordNotUnique)
+    end
+
+    it 'creates two different group order invoice with different invoice_numbers' do
+      expect(goi1.invoice_number).to eq(invoice_number1.to_i)
+      expect(goi3.invoice_number).to eq(invoice_number2.to_i)
+    end
+
+    it 'fails to create two different group order invoice with same invoice_numbers' do
+      goi1
+      expect { goi4 }.to raise_error(ActiveRecord::RecordInvalid)
+    end
+  end
+end