quantity, start_date and stop_date properties are handled separatly

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20979 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Rule.py

@@ -328,7 +328,8 @@ class Rule(Predicate, XMLObject):
                 break
 
             for k, v in prevision.items():
-              if v != movement.getProperty(k):
+              if k not in ('quantity', 'start_date', 'stop_date') and\
+                      v != movement.getProperty(k):
                 prop_dict.setdefault(k, v)
 
         # update movement lists