diff --git a/app/models/group.rb b/app/models/group.rb
index c1976830..68cb015c 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -4,7 +4,7 @@ class Group < ActiveRecord::Base
   has_many :memberships, :dependent => :destroy
   has_many :users, :through => :memberships
 
-  validates :name, :presence => true, :length => {:in => 1..25}, :uniqueness => true
+  validates :name, :presence => true, :length => {:in => 1..25}
   
   attr_reader :user_tokens
   
diff --git a/app/models/ordergroup.rb b/app/models/ordergroup.rb
index 5378cc35..06baa614 100644
--- a/app/models/ordergroup.rb
+++ b/app/models/ordergroup.rb
@@ -16,7 +16,7 @@ class Ordergroup < Group
   has_many :orders, :through => :group_orders
 
   validates_numericality_of :account_balance, :message => I18n.t('ordergroups.model.invalid_balance')
-  validate :uniqueness_of_members
+  validate :uniqueness_of_name, :uniqueness_of_members
 
   after_create :update_stats!
 
@@ -106,6 +106,16 @@ class Ordergroup < Group
       errors.add :user_tokens, I18n.t('ordergroups.model.error_single_group', :user => user.nick) if user.groups.where(:type => 'Ordergroup').size > 1
     end
   end
+
+  # Make sure, the name is uniq, add usefull message if uniq group is already deleted
+  def uniqueness_of_name
+    id = new_record? ? '' : self.id
+    group = Ordergroup.with_deleted.where('groups.id != ? AND groups.name = ?', id, name).first
+    if group.present?
+      message = group.deleted? ? :taken_with_deleted : :taken
+      errors.add :name, message
+    end
+  end
   
 end
 
diff --git a/app/models/supplier.rb b/app/models/supplier.rb
index 05dbeb6c..384c5973 100644
--- a/app/models/supplier.rb
+++ b/app/models/supplier.rb
@@ -12,15 +12,13 @@ class Supplier < ActiveRecord::Base
   attr_accessible :name, :address, :phone, :phone2, :fax, :email, :url, :contact_person, :customer_number,
                   :delivery_days, :order_howto, :note, :shared_supplier_id, :min_order_quantity
 
-  validates :name, :presence => true, :length => { :in => 4..30 }, :uniqueness => true
+  validates :name, :presence => true, :length => { :in => 4..30 }
   validates :phone, :presence => true, :length => { :in => 8..20 }
   validates :address, :presence => true, :length => { :in => 8..50 }
   validates_length_of :order_howto, :note, maximum: 250
-#  validates_length_of :name, :in => 4..30
-#  validates_uniqueness_of :name
-
   validates_length_of :phone, :in => 8..20
   validates_length_of :address, :in => 8..50
+  validate :uniqueness_of_name
 
   # sync all articles with the external database
   # returns an array with articles(and prices), which should be updated (to use in a form)
@@ -66,5 +64,17 @@ class Supplier < ActiveRecord::Base
     end
     return [updated_articles, outlisted_articles]
   end
+
+  protected
+
+  # Make sure, the name is uniq, add usefull message if uniq group is already deleted
+  def uniqueness_of_name
+    id = new_record? ? '' : self.id
+    supplier = Supplier.with_deleted.where('suppliers.id != ? AND suppliers.name = ?', id, name).first
+    if supplier.present?
+      message = supplier.deleted? ? :taken_with_deleted : :taken
+      errors.add :name, message
+    end
+  end
 end
 
diff --git a/app/models/workgroup.rb b/app/models/workgroup.rb
index d154fe3e..21023a43 100644
--- a/app/models/workgroup.rb
+++ b/app/models/workgroup.rb
@@ -5,6 +5,7 @@ class Workgroup < Group
   # returns all non-finished tasks
   has_many :open_tasks, :class_name => 'Task', :conditions => ['done = ?', false], :order => 'due_date ASC'
 
+  validates_uniqueness_of :name
   validates_presence_of :task_name, :weekday, :task_required_users, :next_weekly_tasks_number,
                         :if => :weekly_task
   validates_numericality_of :next_weekly_tasks_number, :greater_than => 0, :less_than => 21, :only_integer => true,
diff --git a/config/locales/de/de.defaults.yml b/config/locales/de/de.defaults.yml
index 8768d3d0..4e9565e5 100644
--- a/config/locales/de/de.defaults.yml
+++ b/config/locales/de/de.defaults.yml
@@ -142,6 +142,7 @@ de:
       odd: muss ungerade sein
       record_invalid: ! 'Gültigkeitsprüfung ist fehlgeschlagen: %{errors}'
       taken: ist bereits vergeben
+      taken_with_deleted: ist bereits vergeben (eine gelöschte Gruppe)
       too_long: ist zu lang (nicht mehr als %{count} Zeichen)
       too_short: ist zu kurz (nicht weniger als %{count} Zeichen)
       wrong_length: hat die falsche Länge (muss genau %{count} Zeichen haben)
diff --git a/config/locales/en/en.defaults.yml b/config/locales/en/en.defaults.yml
index 3d421ad1..a65188e8 100644
--- a/config/locales/en/en.defaults.yml
+++ b/config/locales/en/en.defaults.yml
@@ -142,6 +142,7 @@ en:
       odd: must be odd
       record_invalid: ! 'validation failed: %{errors}'
       taken: is already taken
+      taken_with_deleted: is already taken (deleted group)
       too_long: is too long (no more than %{count} characters)
       too_short: is too short (use more than %{count} characters)
       wrong_length: is the wrong length (has to have exactly %{count} characters)