diff --git a/src/components/production/WorkerScreen/MaterialInputModal.tsx b/src/components/production/WorkerScreen/MaterialInputModal.tsx
index 37a6c420..134021b0 100644
--- a/src/components/production/WorkerScreen/MaterialInputModal.tsx
+++ b/src/components/production/WorkerScreen/MaterialInputModal.tsx
@@ -192,35 +192,20 @@ export function MaterialInputModal({
         return;
       }
 
-      // 복수 item IDs가 있으면 각각 병렬 조회 후 합치기 (절곡 공정 등)
-      const itemIds = workOrderItemIds && workOrderItemIds.length > 0
-        ? workOrderItemIds
-        : workOrderItemId ? [workOrderItemId] : null;
+      // 개소 대표 아이템 1개만 조회 (dynamic_bom은 개소 내 모든 아이템에 동일하게 저장됨)
+      const itemId = workOrderItemId
+        ?? (workOrderItemIds && workOrderItemIds.length > 0 ? workOrderItemIds[0] : null);
 
-      if (itemIds && itemIds.length > 0) {
-        // 개소 내 모든 items의 자재를 병렬 조회
-        const results = await Promise.all(
-          itemIds.map((id) => getMaterialsForItem(order.id, id))
-        );
-        const allMaterials: MaterialForItemInput[] = [];
-        let hasError = false;
-        for (let i = 0; i < results.length; i++) {
-          const result = results[i];
-          if (result.success) {
-            // 각 자재에 소스 work_order_item_id 태깅 (submit 시 올바른 item에 등록하기 위함)
-            const tagged = result.data.map((m) => ({
-              ...m,
-              workOrderItemId: m.workOrderItemId || itemIds[i],
-            }));
-            allMaterials.push(...tagged);
-          } else {
-            hasError = true;
-          }
-        }
-        if (allMaterials.length > 0) {
-          setMaterials(allMaterials);
-        } else if (hasError) {
-          toast.error('자재 목록 조회에 실패했습니다.');
+      if (itemId) {
+        const result = await getMaterialsForItem(order.id, itemId);
+        if (result.success) {
+          const tagged = result.data.map((m) => ({
+            ...m,
+            workOrderItemId: m.workOrderItemId || itemId,
+          }));
+          setMaterials(tagged);
+        } else {
+          toast.error(result.error || '자재 목록 조회에 실패했습니다.');
         }
       } else {
         // 전체 작업지시 기준 조회
@@ -277,31 +262,14 @@ export function MaterialInputModal({
 
     setIsSubmitting(true);
     try {
-      // 복수 item IDs가 있으면 item별로 그룹핑하여 각각 등록
+      // 대표 아이템 기준 자재 투입 등록
       let result: { success: boolean; error?: string };
+      const targetItemId = workOrderItemId
+        ?? (workOrderItemIds && workOrderItemIds.length > 0 ? workOrderItemIds[0] : null);
 
-      if (workOrderItemIds && workOrderItemIds.length > 1) {
-        // inputs를 work_order_item_id별로 그룹핑
-        const grouped = new Map<number, { stock_lot_id: number; qty: number }[]>();
-        for (const input of inputs) {
-          const woItemId = input.work_order_item_id;
-          if (woItemId) {
-            if (!grouped.has(woItemId)) grouped.set(woItemId, []);
-            grouped.get(woItemId)!.push({ stock_lot_id: input.stock_lot_id, qty: input.qty });
-          }
-        }
-        // 각 item별로 병렬 등록
-        const results = await Promise.all(
-          Array.from(grouped.entries()).map(([itemId, itemInputs]) =>
-            registerMaterialInputForItem(order.id, itemId, itemInputs)
-          )
-        );
-        const hasFailure = results.some((r) => !r.success);
-        result = hasFailure
-          ? { success: false, error: results.find((r) => !r.success)?.error }
-          : { success: true };
-      } else if (workOrderItemId) {
-        result = await registerMaterialInputForItem(order.id, workOrderItemId, inputs);
+      if (targetItemId) {
+        const simpleInputs = inputs.map(({ stock_lot_id, qty }) => ({ stock_lot_id, qty }));
+        result = await registerMaterialInputForItem(order.id, targetItemId, simpleInputs);
       } else {
         result = await registerMaterialInput(order.id, inputs);
       }