diff --git a/app/models/group_order_article.rb b/app/models/group_order_article.rb
index 50c1aa0e..3b37a990 100644
--- a/app/models/group_order_article.rb
+++ b/app/models/group_order_article.rb
@@ -167,7 +167,7 @@ class GroupOrderArticle < ActiveRecord::Base
   # the minimum price depending on configuration. When the order is finished it
   # will be the value depending of the article results.
   def total_price(order_article = self.order_article)
-    unless order_article.order.finished?
+    if order_article.order.open?
       if FoodsoftConfig[:tolerance_is_costly]
         order_article.article.fc_price * (quantity + tolerance)
       else
diff --git a/db/migrate/20130702113610_update_group_order_totals.rb b/db/migrate/20130702113610_update_group_order_totals.rb
new file mode 100644
index 00000000..ca9aab67
--- /dev/null
+++ b/db/migrate/20130702113610_update_group_order_totals.rb
@@ -0,0 +1,18 @@
+class UpdateGroupOrderTotals < ActiveRecord::Migration
+  def self.up
+    say "If you have ever modified an order after it was settled, the group_order's " +
+        "price may be calculated incorrectly. This can take a lot of time on a " +
+        "large database."
+
+    say "If you do want to update the ordergroup totals, open the rails console " +
+        "(by running `rails c`), and enter:"
+
+    say "GroupOrder.all.each { |go| go.order.closed? and go.update_price! }", subitem: true
+
+    say "You may want to check first that no undesired accounting issues are introduced. " +
+        "It may be wise to discuss this with those responsible for the ordering finances."
+  end
+
+  def self.down
+  end
+end