diff --git a/sf_plan/models/custom_plan.py b/sf_plan/models/custom_plan.py
index cc82cbe1..d1a82501 100644
--- a/sf_plan/models/custom_plan.py
+++ b/sf_plan/models/custom_plan.py
@@ -70,8 +70,8 @@ class sf_production_plan(models.Model):
     @api.onchange('production_line_id')
     def _compute_production_line_id(self):
         for item in self:
-            item.production_id.production_line_id = item.production_line_id.id
-            item.production_id.plan_start_processing_time = item.date_planned_start
+            item.sudo().production_id.production_line_id = item.production_line_id.id
+            item.sudo().production_id.plan_start_processing_time = item.date_planned_start
 
     @api.onchange('state')
     def _onchange_state(self):