diff --git a/base_partner_sequence/models/partner.py b/base_partner_sequence/models/partner.py
index 29bbf9520..ef150eceb 100644
--- a/base_partner_sequence/models/partner.py
+++ b/base_partner_sequence/models/partner.py
@@ -32,10 +32,14 @@ class ResPartner(models.Model):
     @api.multi
     def write(self, vals):
         for partner in self:
-            if not vals.get('ref') and partner._needsRef(vals) and \
-               not partner.ref:
-                vals['ref'] = partner._get_next_ref(vals=vals)
-            super(ResPartner, partner).write(vals)
+            partner_vals = vals.copy()
+            if (
+                    not partner_vals.get('ref')
+                    and partner._needsRef(partner_vals)
+                    and not partner.ref
+            ):
+                partner_vals['ref'] = partner._get_next_ref(vals=partner_vals)
+            super(ResPartner, partner).write(partner_vals)
         return True
 
     @api.multi
diff --git a/base_partner_sequence/tests/test_base_partner_sequence.py b/base_partner_sequence/tests/test_base_partner_sequence.py
index b5e479cf3..abf7d7885 100644
--- a/base_partner_sequence/tests/test_base_partner_sequence.py
+++ b/base_partner_sequence/tests/test_base_partner_sequence.py
@@ -33,3 +33,16 @@ class TestBasePartnerSequence(common.TransactionCase):
         self.assertEqual(
             self.partner.ref, contact.ref, "All it's ok as sequence doesn't "
                                            "increase.")
+
+    def test_unique_ref_on_write(self):
+        """Assert that create and write gives a different refs if we """
+        vals = [
+            {'name': "test1", 'email': "test@test.com"},
+            {'name': "test2", 'email': "test@test.com"},
+        ]
+        partners = self.env['res.partner'].create(vals)
+        self.assertFalse(partners[0].ref == partners[1].ref)
+        partners.write({'ref': False})
+        self.assertFalse(partners[0].ref)
+        partners.write({})
+        self.assertFalse(partners[0].ref == partners[1].ref)