diff --git a/mhd_wms/src/main/java/com/mhd/wms/domain/outMaterialDetail/repository/persistence/OutMaterialDetailImpl.java b/mhd_wms/src/main/java/com/mhd/wms/domain/outMaterialDetail/repository/persistence/OutMaterialDetailImpl.java
index 9dd9655cf..0a15078d0 100644
--- a/mhd_wms/src/main/java/com/mhd/wms/domain/outMaterialDetail/repository/persistence/OutMaterialDetailImpl.java
+++ b/mhd_wms/src/main/java/com/mhd/wms/domain/outMaterialDetail/repository/persistence/OutMaterialDetailImpl.java
@@ -611,8 +611,8 @@ public class OutMaterialDetailImpl extends ServiceImpl<OutMaterialDetailMapper,
                 ? outMaterialDetailDb.getAllocationQuantity() 
                 : BigDecimal.ZERO;
             // 分配数量和已分配数量都减少：本次手动取消分配视为“把这条明细已分配的全部撤回”
-            BigDecimal newAllocationQuantity = dbAllocationQuantity.subtract(allocationQuantity);
-            if ((newAllocationQuantity.add(childAllocationQuantity)).compareTo(BigDecimal.ZERO) < 0) {
+            BigDecimal newAllocationQuantity = dbAllocationQuantity.add(childAllocationQuantity).subtract(allocationQuantity);
+            if ((newAllocationQuantity).compareTo(BigDecimal.ZERO) < 0) {
                 throw new ServiceException("物料" + outMaterialDetailDb.getMaterialName() + "，取消分配数量不能大于分配总数");
             }
             outMaterialDetail.setAllocationQuantity(newAllocationQuantity);