diff --git a/modules/purchase_trade/fee.py b/modules/purchase_trade/fee.py
index ea66da6..bc7e87a 100755
--- a/modules/purchase_trade/fee.py
+++ b/modules/purchase_trade/fee.py
@@ -376,7 +376,7 @@ class Fee(ModelSQL,ModelView):
                         Warning = Pool().get('res.user.warning')
                         warning_name = Warning.format("Lot ever received", [])
                         if Warning.check(warning_name):
-                            raise Warning(warning_name,
+                            raise UserWarning(warning_name,
                                         "By clicking yes, an accrual for this fee will be created")
                         AccountMove = Pool().get('account.move')
                         account_move = move._get_account_stock_move_fee(record.id)