add reference & version on budget

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30896 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Budget.py

@@ -55,6 +55,8 @@ class Budget(Predicate, Variated):
                       , PropertySheet.Budget
                       , PropertySheet.Path
                       , PropertySheet.VariationRange
+                      , PropertySheet.Reference
+                      , PropertySheet.Version
                       )
 
     # CMF Type Definition