only patch Currency, not Base

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18593 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Banking/Document/BankingOperation.py

@@ -37,7 +37,7 @@ from Products.ERP5.Document.AccountingTransaction import AccountingTransaction
 from AccessControl.PermissionRole import PermissionRole
 from Products.ERP5Type.Utils import convertToMixedCase, convertToUpperCase
 from Products.ERP5Banking.BaobabMixin import BaobabMixin
-from Products.ERP5Type.Base import Base
+from Products.ERP5Type.Document.Currency import Currency
 
 
 class BankingOperation(BaobabMixin, AccountingTransaction):
@@ -256,4 +256,4 @@ def getDeliveryValue(self):
   """
   return self
 
-Base.getDeliveryValue = getDeliveryValue
+Currency.getDeliveryValue = getDeliveryValue