available budget must use engaged budget, not consumed budget

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25194 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BudgetCell.py

@@ -121,7 +121,7 @@ class BudgetCell(Predicate, MetaNode):
       """
       Return available budget.
       """
-      return self.getCurrentBalance() - self.getConsumedBudget()
+      return self.getCurrentBalance() - self.getEngagedBudget()
 
     security.declareProtected(Permissions.AccessContentsInformation, 'getEngagedBudget')
     def getEngagedBudget(self, src__=0):