diff --git a/addons/sale_project/models/project.py b/addons/sale_project/models/project.py
index 8a463260bc5..2e30ae70eca 100644
--- a/addons/sale_project/models/project.py
+++ b/addons/sale_project/models/project.py
@@ -84,8 +84,8 @@ class ProjectTask(models.Model):
                 if not task.sale_line_id.is_service or task.sale_line_id.is_expense:
                     raise ValidationError(_(
                         'You cannot link the order item %(order_id)s - %(product_id)s to this task because it is a re-invoiced expense.',
-                        order_id=task.sale_line_id.order_id.id,
-                        product_id=task.sale_line_id.product_id.name,
+                        order_id=task.sale_line_id.order_id.name,
+                        product_id=task.sale_line_id.product_id.display_name,
                     ))
 
     @api.ondelete(at_uninstall=False)