diff --git a/sale_start_end_dates/models/sale_order.py b/sale_start_end_dates/models/sale_order.py
index 0acd7cdacd6..172e412d81d 100644
--- a/sale_start_end_dates/models/sale_order.py
+++ b/sale_start_end_dates/models/sale_order.py
@@ -166,7 +166,7 @@ def _compute_start_date(self):
                 line.start_date = order.default_start_date
             elif line.start_date and not line.product_id.must_have_dates:
                 line.start_date = False
-            elif line.end_date and line.start_date and line.start_date > self.end_date:
+            elif line.end_date and line.start_date and line.start_date > line.end_date:
                 line.start_date = line.end_date
 
     @api.depends("start_date", "product_id")
@@ -181,5 +181,5 @@ def _compute_end_date(self):
                 line.end_date = order.default_end_date
             elif line.end_date and not line.product_id.must_have_dates:
                 line.end_date = False
-            elif line.end_date and line.start_date and line.start_date > self.end_date:
+            elif line.end_date and line.start_date and line.start_date > line.end_date:
                 line.end_date = line.start_date