Supply should be a Predicate.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3322 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Supply.py

@@ -40,6 +40,7 @@ class Supply(Path,XMLObject):
     portal_type = 'Supply'
     isPortalContent = 1
     isRADContent = 1
+    isPredicate = 1
 
     # Declarative security
     security = ClassSecurityInfo()