[FIX] base_vat: Fix vat number starting with 'EU' for not-EU companies

Foreign companies that trade with non-enterprises in the EU may have a VATIN starting with "EU" instead of a country code.

Currently, the user is facing a traceback in this situation since stdnum doesn't have any format method for vat number starting with 'EU'.

closes odoo/odoo#93536

Ticket: 2877716
X-original-commit: 0f9f8409b379e3a0af28cecd3ed26829b9b26032
Signed-off-by: Olivier Colson (oco) <oco@odoo.com>
Signed-off-by: Laurent Smet <las@odoo.com>

addons/base_vat/models/res_partner.py

@@ -577,6 +577,11 @@ class ResPartner(models.Model):
             return len(vat) == 11 and vat.isdigit()
         return check_func(vat)
 
+    def format_vat_eu(self, vat):
+        # Foreign companies that trade with non-enterprises in the EU
+        # may have a VATIN starting with "EU" instead of a country code.
+        return vat
+
     def format_vat_ch(self, vat):
         stdnum_vat_format = getattr(stdnum.util.get_cc_module('ch', 'vat'), 'format', None)
         return stdnum_vat_format('CH' + vat)[2:] if stdnum_vat_format else vat

addons/base_vat/tests/test_validate_ruc.py

@@ -80,6 +80,13 @@ class TestStructure(TransactionCase):
         # (for technical reasons due to ORM and res.company making related fields towards res.partner for country_id and vat)
         test_partner.write({'vat': '0477472701', 'country_id': None})
 
+    def test_vat_eu(self):
+        """ Foreign companies that trade with non-enterprises in the EU may have a VATIN starting with "EU" instead of
+        a country code.
+        """
+        test_partner = self.env['res.partner'].create({'name': "Turlututu", 'country_id': self.env.ref('base.fr').id})
+        test_partner.write({'vat': "EU528003646", 'country_id': None})
+
 
 @tagged('-standard', 'external')
 class TestStructureVIES(TestStructure):