[FIX] account_payment_order: add missing option "structured" to payment line ref type

The payment line reference type takes its value from the invoice reference
type, and both fields must have the same options.
The missing option "structured" causes a bug during payment creation.

the test is modified to be able to reproduce the problem.

account_payment_order/models/account_move.py

@@ -51,9 +51,7 @@ class AccountMove(models.Model):
         """Retrieve the communication string for this direct item."""
         communication = self.payment_reference or self.ref or self.name
         if self.is_invoice():
-            if (self.reference_type or "none") != "none":
-                communication = self.ref
-            elif self.is_purchase_document():
+            if self.is_purchase_document():
                 communication = self.ref or self.payment_reference
             else:
                 communication = self.payment_reference or self.name

account_payment_order/models/account_payment_line.py

@@ -78,7 +78,9 @@ class AccountPaymentLine(models.Model):
         required=False, help="Label of the payment that will be seen by the destinee"
     )
     communication_type = fields.Selection(
-        selection=[("normal", "Free")], required=True, default="normal"
+        selection=[("normal", "Free"), ("structured", "Structured")],
+        required=True,
+        default="normal",
     )
     payment_ids = fields.Many2many(
         comodel_name="account.payment",

account_payment_order/tests/test_payment_order_inbound.py

@@ -77,6 +77,7 @@ class TestPaymentOrderInboundBase(AccountTestInvoicingCommon):
                 invoice_line_form.price_unit = 100.0
                 invoice_line_form.account_id = self.invoice_line_account
                 invoice_line_form.tax_ids.clear()
+        invoice_form.reference_type = "structured"
         invoice = invoice_form.save()
         invoice_form = Form(invoice)
         invoice_form.payment_mode_id = self.inbound_mode