diff --git a/addons/sale_loyalty_delivery/models/sale_order.py b/addons/sale_loyalty_delivery/models/sale_order.py
index 822707cd220..baa937f7fd1 100644
--- a/addons/sale_loyalty_delivery/models/sale_order.py
+++ b/addons/sale_loyalty_delivery/models/sale_order.py
@@ -11,18 +11,19 @@ class SaleOrder(models.Model):
     # delivery overrides
 
     def _compute_amount_total_without_delivery(self):
-        self.ensure_one()
-        lines = self.order_line.filtered(lambda l: l.coupon_id and l.coupon_id.program_type in ['ewallet', 'gift_card'])
-        return super()._compute_amount_total_without_delivery() - sum(lines.mapped('price_unit'))
+        res = super()._compute_amount_total_without_delivery()
+        return res - sum(
+            self.order_line.filtered(
+                lambda l: l.coupon_id and l.coupon_id.program_type in ['ewallet', 'gift_card']
+            ).mapped('price_unit')
+        )
 
     # sale_loyalty overrides
 
     def _get_no_effect_on_threshold_lines(self):
-        self.ensure_one()
-        lines = self.order_line.filtered(lambda line:\
-            line.is_delivery or\
-            line.reward_id.reward_type == 'shipping')
-        return lines + super()._get_no_effect_on_threshold_lines()
+        res = super()._get_no_effect_on_threshold_lines()
+        return res + self.order_line.filtered(
+            lambda line: line.is_delivery or line.reward_id.reward_type == 'shipping')
 
     def _get_reward_values_free_shipping(self, reward, coupon, **kwargs):
         delivery_line = self.order_line.filtered(lambda l: l.is_delivery)