- form_for([:finance, @invoice]) do |f|
  = f.error_messages
  = f.hidden_field :delivery_id

  - if @invoice.delivery
    %p= "Diese Rechnung ist mit einer #{link_to "Lieferung", [@invoice.supplier,@invoice.delivery]} verknüpft."
  %p
    = f.label :supplier_id
    %br/
    = f.select :supplier_id, Supplier.all.collect { |s| [s.name, s.id] }
  %p
    = f.label :number
    %br/
    = f.text_field :number
  %p
    = f.label :date
    %br/
    = f.date_select :date
  %p
    = f.label :paid_on
    %br/
    = f.date_select :paid_on, :include_blank => true
  %p
    = f.label :amount
    %br/
    = f.text_field :amount
  %p
    = f.label :note
    %br/
    = f.text_area :note
  %p
    = f.submit "Speichern"