update 特权减免金额不能大于总金额

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

@@ -580,7 +580,7 @@ public class StudentRepairServiceImpl extends BaseServiceImpl<Integer, StudentRe
             BigDecimal reduce = repairGoodsDtos.stream().map(e -> e.getGroupPurchasePrice()).reduce(BigDecimal.ZERO, BigDecimal::add);
             amount = amount.add(reduce);
         }
-        amount = amount.subtract(repairInfo.getExemptionAmount());
+        amount = amount.subtract(studentRepair.getExemptionAmount());
 
         String orderNo = idGeneratorService.generatorId("payment") + "";
         studentRepair.setIsUseBalancePayment(repairInfo.getIsUseBalancePayment());