diff --git a/addons/sale_stock/models/sale_order.py b/addons/sale_stock/models/sale_order.py
index 4d13c64f9af..b9eb85708e6 100644
--- a/addons/sale_stock/models/sale_order.py
+++ b/addons/sale_stock/models/sale_order.py
@@ -231,7 +231,7 @@ class SaleOrderLine(models.Model):
             if line.order_id.commitment_date:
                 date = line.order_id.commitment_date
             else:
-                confirm_date = line.order_id.confirmation_date if line.order_id.state in ['sale', 'done'] else datetime.now()
+                confirm_date = line.order_id.date_order if line.order_id.state in ['sale', 'done'] else datetime.now()
                 date = confirm_date + timedelta(days=line.customer_lead or 0.0)
             grouped_lines[(warehouse.id, date)] |= line