Add maturity date

modules/purchase_trade/invoice.py

@@ -712,6 +712,14 @@ class Invoice(metaclass=PoolMeta):
         return self._get_report_bank_swift(
             self._get_report_melya_bank_account())
 
+    @property
+    def report_melya_maturity_date(self):
+        maturity_dates = [
+            line.maturity_date for line in (self.lines_to_pay or [])
+            if getattr(line, 'maturity_date', None)]
+        if maturity_dates:
+            return min(maturity_dates)
+
     @property
     def _report_payment_order_company_account(self):
         return self._get_report_bank_account(getattr(self.company, 'party', None))

modules/purchase_trade/tests/test_module.py

@@ -3293,6 +3293,21 @@ class PurchaseTradeTestCase(ModuleTestCase):
             'CH36 0021 5215 2487 7461 D')
         self.assertEqual(invoice.report_melya_bank_swift, 'UBSWCHZH80A')
 
+    def test_invoice_melya_maturity_date_uses_lines_to_pay(self):
+        'invoice_melya maturity date uses the earliest line to pay maturity'
+        Invoice = Pool().get('account.invoice')
+
+        invoice = Invoice()
+        invoice.lines_to_pay = [
+            Mock(maturity_date=datetime.date(2026, 9, 9)),
+            Mock(maturity_date=datetime.date(2026, 8, 9)),
+            Mock(maturity_date=None),
+        ]
+
+        self.assertEqual(
+            invoice.report_melya_maturity_date,
+            datetime.date(2026, 8, 9))
+
     def test_sale_report_deal_uses_purchase_and_sale_numbers(self):
         'sale deal number includes the linked purchase number'
         Sale = Pool().get('sale.sale')