show different warning signs for mismatch with ordered and received

app/models/order_article.rb

@@ -97,9 +97,16 @@ class OrderArticle < ActiveRecord::Base
     units_to_order * price.unit_quantity * price.gross_price
   end
 
-  def ordered_quantities_equal_to_group_orders?
-    # the rescue is a workaround for units_to_order not being defined in integration tests
-    (units_to_order * price.unit_quantity) == group_orders_sum[:quantity] rescue false
+  def ordered_quantities_different_from_group_orders?(ordered_mark="!", billed_mark="?", received_mark="?")
+    if not units_received.nil?
+      ((units_received * price.unit_quantity) == group_orders_sum[:quantity]) ? false : received_mark
+    elsif not units_billed.nil?
+      ((units_billed * price.unit_quantity) == group_orders_sum[:quantity]) ? false : billed_mark
+    elsif not units_to_order.nil?
+      ((units_to_order * price.unit_quantity) == group_orders_sum[:quantity]) ? false : ordered_mark
+    else
+      nil # can happen in integration tests
+    end
   end
 
   # redistribute articles over ordergroups

app/views/finance/balancing/_order_article.html.haml

@@ -4,8 +4,8 @@
 %td{title: units_history_line(order_article)}
   = order_article.units
   %i.package pkg
-  - unless order_article.ordered_quantities_equal_to_group_orders?
-    %span{:style => "color:red;font-weight: bold"} !
+  - if s=order_article.ordered_quantities_different_from_group_orders?
+    %span{:style => "color:red;font-weight: bold"}= s
 %td #{order_article.price.unit_quantity} × #{order_article.article.unit}
 %td
   = number_to_currency(order_article.price.price, :unit => "")