[16.0][FIX] sale_advance_payment: Amount residual with signed invoice amount

sale_advance_payment/models/sale.py

@@ -82,7 +82,9 @@ def _compute_advance_payment(self):
             # Consider payments in related invoices.
             invoice_paid_amount = 0.0
             for inv in order.invoice_ids:
-                invoice_paid_amount += inv.amount_total - inv.amount_residual
+                invoice_paid_amount += (
+                    inv.amount_total_signed - inv.amount_residual_signed
+                )
             amount_residual = order.amount_total - advance_amount - invoice_paid_amount
             payment_state = "not_paid"
             if mls:

sale_advance_payment/tests/test_sale_advance_payment.py

@@ -482,3 +482,33 @@ def test_04_sale_advance_payment_multi_inv_validate_wiz(self):
         payments = invoice.invoice_outstanding_credits_debits_widget
         result = [d["amount"] for d in payments["content"]]
         self.assertEqual(set(payment_list), set(result))
+
+    def test_05_residual_amount_credit_note(self):
+        self.sale_order_1.action_confirm()
+        self.sale_order_1._create_invoices()
+        invoice = self.sale_order_1.invoice_ids[0]
+        invoice.invoice_date = fields.Date.today()
+        invoice.action_post()
+        self.env["account.payment.register"].with_context(
+            active_model="account.move", active_ids=invoice.ids
+        ).create(
+            {
+                "amount": 3600.0,
+                "group_payment": True,
+                "payment_difference_handling": "open",
+            }
+        )._create_payments()
+        self.assertEqual(self.sale_order_1.amount_residual, 0)
+        credit_note = invoice._reverse_moves()
+        credit_note.invoice_date = fields.Date.today()
+        credit_note.action_post()
+        self.env["account.payment.register"].with_context(
+            active_model="account.move", active_ids=credit_note.ids
+        ).create(
+            {
+                "amount": 3600.0,
+                "group_payment": True,
+                "payment_difference_handling": "open",
+            }
+        )._create_payments()
+        self.assertEqual(self.sale_order_1.amount_residual, 3600)