fix

partner_multi_relation_parent/models/res_partner_relation.py

@@ -114,6 +114,7 @@ class ResPartnerRelation(models.Model):
         # there is no relation, so we can create it, but we must update
         # the parent_id of the left contact of this new relation
         res = super(ResPartnerRelation, self).create(vals=vals)
+        if res.type_id.id == type_relation:
             res.left_partner_id.with_context(no_relation_update=True).write(
                 {'parent_id': vals['right_partner_id']}
             )