修改添加回访记录

mec-biz/src/main/java/com/ym/mec/biz/service/impl/MusicGroupServiceImpl.java

@@ -697,7 +697,7 @@ public class MusicGroupServiceImpl extends BaseServiceImpl<String, MusicGroup> i
                 //团购乐器减免课程费用
                 if (goodsGroup.getType().equals(GoodsType.INSTRUMENT) && goodsGroup.getRemissionCourseFee() != null && musicOneSubjectClassPlan.getKitGroupPurchaseType().equals(KitGroupPurchaseTypeEnum.GROUP)) {//团购
                     orderAmount = orderAmount.subtract(goodsGroup.getRemissionCourseFee());
-                    courseFee.subtract(goodsGroup.getRemissionCourseFee());
+                    courseFee = courseFee.subtract(goodsGroup.getRemissionCourseFee());
                 }
             }
         } else if (registerPayDto.getGoodsGroups() != null && registerPayDto.getGoodsGroups().size() > 0) {