Fix Bug #503: AI修复

com/openhis/web/inpatient/service/impl/DispenseServiceImpl.java

@@ -58,11 +58,13 @@ public class DispenseServiceImpl {
     @Transactional(rollbackFor = Exception.class)
     public Map<String, Object> returnDrug(Long dispenseId, Integer quantity) {
         // 1. 写入退药明细（负数表示退药）
-        dispenseMapper.insertDetail(dispenseId, -quantity);
+        int returnQty = -Math.abs(quantity);
+        dispenseMapper.insertDetail(dispenseId, returnQty);
 
-        // 2. 同步更新汇总单统计
-        dispenseMapper.updateSummaryAfterDetail(dispenseId, -quantity);
+        // 2. 同步更新汇总单统计（在同事务内完成，确保时机一致）
+        dispenseMapper.updateSummaryAfterDetail(dispenseId, returnQty);
 
+        // 3. 返回统一结构
         return Map.of("code", 0, "msg", "退药成功");
     }
 }