diff --git a/xkt/src/main/resources/mapper/StoreSaleDetailMapper.xml b/xkt/src/main/resources/mapper/StoreSaleDetailMapper.xml
index 862ff4bde..6a4bc9c35 100644
--- a/xkt/src/main/resources/mapper/StoreSaleDetailMapper.xml
+++ b/xkt/src/main/resources/mapper/StoreSaleDetailMapper.xml
@@ -13,6 +13,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
             ssd.prod_art_num,
             ssd.price,
             ssd.discounted_price,
+            ABS(ssd.price) - ABS(ssd.discounted_price) AS discount,
             spcs.standard,
             -(ssd.quantity) AS quantity,
             -(ssd.amount) AS amount,
@@ -41,6 +42,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
             ssd.prod_art_num,
             ssd.price,
             ssd.discounted_price,
+            ABS(ssd.price) - ABS(ssd.discounted_price) AS discount,
             spcs.standard,
             -(ssd.quantity) AS quantity,
             -(ssd.amount) AS amount,