diff --git a/common/detail.js b/common/detail.js
index 07d28531..c0d297ed 100644
--- a/common/detail.js
+++ b/common/detail.js
@@ -59,7 +59,7 @@ export function calcHandleQty(detailSource) {
 		item.handleQty = 0;
 		for (let detail of item.subList) {
 			if (detail != undefined && detail.scaned) {
-				item.handleQty += Number(detail.handleQty)
+				item.handleQty = calc.add(item.handleQty,detail.handleQty)
 			}
 		}
 	}