[IMP] account_edi_ubl_cii: always set customer reference

For PEPPOL, the Customer Reference field on invoices is a required
field. In Odoo it can be blank when creating an invoice from scratch.
In order to avoid errors when sending PEPPOL invoices, we want to
set the Customer Reference to the invoice name when no reference was
provided.

task-3499548

closes odoo/odoo#135158

Signed-off-by: Laurent Smet (las) <las@odoo.com>

addons/account_edi_ubl_cii/models/account_edi_xml_ubl_20.py

@@ -491,7 +491,7 @@ class AccountEdiXmlUBL20(models.AbstractModel):
         sales_order_id = 'sale_line_ids' in invoice.invoice_line_ids._fields \
                          and ",".join(invoice.invoice_line_ids.sale_line_ids.order_id.mapped('name'))
         # OrderReference/ID (order_reference) is mandatory inside the OrderReference node !
-        order_reference = invoice.ref or invoice.name if sales_order_id else invoice.ref
+        order_reference = invoice.ref or invoice.name
 
         vals = {
             'builder': self,

addons/l10n_sa_edi/tests/compliance/simplified/invoice.xml

@@ -9,6 +9,9 @@
   <cbc:DocumentCurrencyCode>SAR</cbc:DocumentCurrencyCode>
   <cbc:TaxCurrencyCode>SAR</cbc:TaxCurrencyCode>
   <cbc:BuyerReference>Mohammed Ali</cbc:BuyerReference>
+  <cac:OrderReference>
+    <cbc:ID>INV/2023/00034</cbc:ID>
+  </cac:OrderReference>
   <cac:AdditionalDocumentReference>
     <cbc:ID>QR</cbc:ID>
     <cac:Attachment>

addons/l10n_sa_edi/tests/compliance/standard/invoice.xml

@@ -12,6 +12,9 @@
     <cbc:DocumentCurrencyCode>SAR</cbc:DocumentCurrencyCode>
     <cbc:TaxCurrencyCode>SAR</cbc:TaxCurrencyCode>
     <cbc:BuyerReference>Azure Interior</cbc:BuyerReference>
+    <cac:OrderReference>
+        <cbc:ID>INV/2022/00014</cbc:ID>
+    </cac:OrderReference>
     <cac:AdditionalDocumentReference>
         <cbc:ID>PIH</cbc:ID>
         <cac:Attachment>