diff --git a/ext/custom-addons/dp_custom/models/res_partner.py b/ext/custom-addons/dp_custom/models/res_partner.py
index cb3e7ff9..3ff96c32 100644
--- a/ext/custom-addons/dp_custom/models/res_partner.py
+++ b/ext/custom-addons/dp_custom/models/res_partner.py
@@ -28,6 +28,7 @@ from odoo import tools, api, fields, models, _
 from odoo.exceptions import ValidationError
 from dateutil.relativedelta import relativedelta
 import dateutil.parser
+import datetime
 
 try:
     import stdnum.eu.vat as stdnum_vat
@@ -69,7 +70,7 @@ class Partner(models.Model):
     partner_sector_id = fields.Many2one(comodel_name='res.partner.sector', string='Branche')
     active = fields.Boolean(track_visibility='onchange')
     portal_export_pending = fields.Boolean(string='Portal Export ausständig')
-    date_vat_check = fields.Date(string='Datum der letzten UID-Prüfung', default='2000-01-01')
+    date_vat_check = fields.Date(string='Datum der letzten UID-Prüfung')
     warn_vat_date = fields.Boolean(compute='_get_warn_date', store=False, default=False)
     collective_bill = fields.Boolean(string='Sammelrechnung', default=True)
     country_id = fields.Many2one('res.country', string='Country', ondelete='restrict', default=_default_country_id)
@@ -87,7 +88,12 @@ class Partner(models.Model):
             if record.date_vat_check:
                 date_today = fields.Date.from_string(fields.Date.context_today(self))
                 warn_date = date_today - relativedelta(months=+3)
-                check_date = dateutil.parser.parse(record.date_vat_check).date()
+                try:
+                    # if record.date_vat_check < '2000-01-01':
+                    #     record.date_vat_check = '2000-01-01'
+                    check_date = dateutil.parser.parse(record.date_vat_check).date()
+                except:
+                    check_date = date_today - relativedelta(months=+36)
                 if check_date < warn_date:
                     record.warn_vat_date = True