typo.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21503 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/MovementGroup.py

@@ -1179,6 +1179,6 @@ class PaymentModeMovementGroup(PropertyMovementGroup):
   """ Group movements that have the same payment mode."""
   _property = 'payment_mode'
 
-class ColourMovementGroup(RootMovementGroup):
+class ColourMovementGroup(PropertyMovementGroup):
   """ Group movements that have the same colour category."""
   _property = 'colour'