备货单审批增加兜底检查

app/common/service/StockOrdersService.php

@@ -353,6 +353,10 @@ class StockOrdersService
     {
         $config = $this->buildQueryConfig($request, 'approval');
         $item = $this->logicShow($config);
+
+        if (!$item || $item->approval_status != 0) {
+            throw new BusinessException('该单据已提交审批或单子不存在');
+        }
         
         // 检查备货单是否包含必需的文件
         $this->validateRequiredFilesForApproval($item);