diff --git a/app/Services/OrderService.php b/app/Services/OrderService.php
index 9ff6daa..ec9a7ee 100644
--- a/app/Services/OrderService.php
+++ b/app/Services/OrderService.php
@@ -43,7 +43,8 @@ public function index(array $params)
 
         $query = Order::query()
             ->where('tenant_id', $tenantId)
-            ->with(['client:id,name,manager_name', 'items', 'quote:id,quote_number']);
+            ->with(['client:id,name,manager_name', 'items', 'quote:id,quote_number'])
+            ->withSum('rootNodes', 'quantity');
 
         // 작업지시 생성 가능한 수주만 필터링
         if ($forWorkOrder) {