modules/account_invoice/invoice.py

@@ -1286,9 +1286,12 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin, InvoiceReportMixin):
         remainder = sum(l.debit - l.credit for l in move_lines)
         if self.payment_term:
             payment_date = self.payment_term_date or self.invoice_date or today
-            purchase_line = int(str(self.lines[0].origin).split(",")[1]) if self.lines[0].origin else None
+            model = str(self.lines[0].origin).split(",")[0] if self.lines[0].origin else None
+            if model:
+                Line = Pool().get(model)
+                line = Line(int(str(self.lines[0].origin).split(",")[1]))
                 term_lines = self.payment_term.compute(
-                self.total_amount, self.currency, payment_date, purchase_line)
+                    self.total_amount, self.currency, payment_date, line)
         else:
             term_lines = [(self.payment_term_date or today, self.total_amount)]
         past_payment_term_dates = []

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, purchase_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, purchase_line)
+            value_date = line.get_date(date, line)
             if value is None or not value_date:
                 continue
             if ((remainder - value) * sign) < Decimal(0):