diff --git a/ext/custom-addons/dp_custom/models/res_partner.py b/ext/custom-addons/dp_custom/models/res_partner.py
index f47fa1bd..af66de18 100644
--- a/ext/custom-addons/dp_custom/models/res_partner.py
+++ b/ext/custom-addons/dp_custom/models/res_partner.py
@@ -92,6 +92,7 @@ class Partner(models.Model):
     commission_account_ids = fields.Many2many(comodel_name='commission.account', string='Provisionsempfänger')
     partner_flash = fields.Char()
     fax = fields.Char(string='Fax')
+    user_id = fields.Many2one(track_visibility='onchange')
 
 # make pricelist searchable (store=True) --> code copied from: \ext\odoo\addons\product\models\res_partner.py!
     property_product_pricelist = fields.Many2one(