diff --git a/cor_custom/models/analytic.py b/cor_custom/models/analytic.py
index 9e35ea1..716634b 100755
--- a/cor_custom/models/analytic.py
+++ b/cor_custom/models/analytic.py
@@ -17,12 +17,15 @@ class AccountAnalyticLine(models.Model):
     end_time = fields.Float(string='End Time', digits=(16, 2))
     unit_amount = fields.Float('Duration', default=0.0)
     parent_project = fields.Many2one('project.project', string='Parent Project')
-    #sub_project = fields.Many2one('project.project', string='Sub Project')
 
     @api.onchange('project_id')
     def _onchange_parent_project_id(self):
-        if self.project_id and self.project_id.sub_project:
-            self.parent_project = self.project_id.sub_project.id
+        if self.project_id:
+            parent_project = self.env['project.project'].search([('sub_project', '=', self.project_id.id)], limit=1)
+            if parent_project:
+                self.parent_project = parent_project.id
+            else:
+                self.parent_project = False
         else:
             self.parent_project = False