listProjectStatus mbom_detail.qty 캐스트 오류 수정

NULLIF(MD.QTY, '')::numeric 패턴은 numeric 컬럼을 빈 문자열과 비교하여
"invalid input syntax for type numeric" 에러 발생 → 전체 SELECT 실패 → 빈 그리드.
MD.QTY 만 사용 (이미 numeric, SUM은 NULL safe).

backend-node/src/services/purchaseService.ts

@@ -755,7 +755,7 @@ export async function listProjectStatus(filter: PurchaseListFilter): Promise<Lis
                   JOIN MBOM_HEADER MH2 ON MD.MBOM_HEADER_OBJID = MH2.OBJID
                  WHERE MH2.PROJECT_OBJID = PM.OBJID::VARCHAR
                    AND MH2.STATUS = 'Y'), 0)                AS total_item_cnt,
-      COALESCE((SELECT SUM(NULLIF(MD.QTY, '')::numeric)
+      COALESCE((SELECT SUM(MD.QTY)
                   FROM MBOM_DETAIL MD
                   JOIN MBOM_HEADER MH2 ON MD.MBOM_HEADER_OBJID = MH2.OBJID
                  WHERE MH2.PROJECT_OBJID = PM.OBJID::VARCHAR
@@ -788,7 +788,7 @@ export async function listProjectStatus(filter: PurchaseListFilter): Promise<Lis
                        AND POM2.STATUS = 'create'), 0)
       , 0)                                                  AS non_po_item_cnt,
       GREATEST(
-        COALESCE((SELECT SUM(NULLIF(MD.QTY, '')::numeric)
+        COALESCE((SELECT SUM(MD.QTY)
                     FROM MBOM_DETAIL MD
                     JOIN MBOM_HEADER MH2 ON MD.MBOM_HEADER_OBJID = MH2.OBJID
                    WHERE MH2.PROJECT_OBJID = PM.OBJID::VARCHAR