Supply Cell must be a subclass of PredicateGroup in order to call test method.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2643 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/SupplyCell.py

@@ -34,8 +34,9 @@ from Products.ERP5Type import Permissions, PropertySheet, Constraint, Interface
 
 from Products.ERP5.Document.DeliveryCell import DeliveryCell
 from Products.ERP5.Document.Path import Path
+from Products.ERP5.Document.PredicateGroup import PredicateGroup
 
-class SupplyCell(DeliveryCell, Path):
+class SupplyCell(PredicateGroup, DeliveryCell, Path):
     """
       A DeliveryCell allows to define specific quantities
       for each variation of a resource in a delivery line.