diff --git a/modules/account_invoice/payment_term.py b/modules/account_invoice/payment_term.py
index 558f666..255cceb 100755
--- a/modules/account_invoice/payment_term.py
+++ b/modules/account_invoice/payment_term.py
@@ -48,7 +48,7 @@ class PaymentTerm(DeactivableMixin, ModelSQL, ModelView):
                         '.msg_payment_term_missing_last_remainder',
                         payment_term=term.rec_name))
 
-    def compute(self, amount, currency, date, line = None):
+    def compute(self, amount, currency, date, line_ = None):
         """Calculate payment terms and return a list of tuples
         with (date, amount) for each payment term line.
 
@@ -61,7 +61,7 @@ class PaymentTerm(DeactivableMixin, ModelSQL, ModelView):
         remainder = amount
         for line in self.lines:
             value = line.get_value(remainder, amount, currency)
-            value_date = line.get_date(date, line)
+            value_date = line.get_date(date, line_)
             if value is None or not value_date:
                 continue
             if ((remainder - value) * sign) < Decimal(0):