diff --git a/models/calendar.py b/models/calendar.py
index 7d9cd8739482d72a5464fdfe0147fd7aadf51be5..66b48450f7ae416393c4269d08918c515074e0d0 100644
--- a/models/calendar.py
+++ b/models/calendar.py
@@ -57,8 +57,6 @@ class CGScopCalendar(models.Model):
     def _onchange_project_id(self):
         if self.project_id.partner_id:
             self.coop_id = self.project_id.partner_id
-        else:
-            self.coop_id = False
      
     @api.onchange('coop_id')
     def _onchange_coop_id(self):