add isAccountable method to use getInventory method on this objects

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17782 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/PaySheetCell.py

@@ -73,3 +73,6 @@ class PaySheetCell(InvoiceCell):
         We do not need conversion here
       """
       return self.getQuantity()
+
+    def isAccountable(self):
+      return 1

product/ERP5/Document/PaySheetLine.py

@@ -79,3 +79,5 @@ class PaySheetLine(InvoiceLine):
       self.invokeFactory(type_name="Pay Sheet Cell",id=id)
       return self.get(id)
       
+    def isAccountable(self):
+      return 1