diff --git a/base_partner_sequence/models/partner.py b/base_partner_sequence/models/partner.py
index 8a3c74b84..29bbf9520 100644
--- a/base_partner_sequence/models/partner.py
+++ b/base_partner_sequence/models/partner.py
@@ -34,7 +34,7 @@ class ResPartner(models.Model):
         for partner in self:
             if not vals.get('ref') and partner._needsRef(vals) and \
                not partner.ref:
-                vals['ref'] = self._get_next_ref(vals=vals)
+                vals['ref'] = partner._get_next_ref(vals=vals)
             super(ResPartner, partner).write(vals)
         return True