[FIX] l10n_co: only validate VAT for RUT document types

In Colombia customers can legally identify themselves with various
codes, one of which is the RUT. This is the traditional TIN and
adheres to the rules implement by base_vat. The other types however
don't and so shouldn't be checked by base_vat.

opw-781247

addons/l10n_co/models/res_partner.py

@@ -40,3 +40,16 @@ class ResPartner(models.Model):
                     partner.l10n_co_verification_code = 11 - number
             except ValueError:
                 partner.l10n_co_verification_code = False
+
+    @api.constrains('vat', 'commercial_partner_country_id', 'l10n_co_document_type')
+    def check_vat(self):
+        # check_vat is implemented by base_vat which this localization
+        # doesn't directly depend on. It is however automatically
+        # installed for Colombia.
+        if self.sudo().env.ref('base.module_base_vat').state == 'installed':
+            # don't check Colombian partners unless they have RUT (= Colombian VAT) set as document type
+            self = self.filtered(lambda partner: partner.country_id != self.env.ref('base.co') or\
+                                                 partner.l10n_co_document_type == 'rut')
+            return super(ResPartner, self).check_vat()
+        else:
+            return True