diff --git a/frontend/lib/registry/components/repeat-screen-modal/RepeatScreenModalComponent.tsx b/frontend/lib/registry/components/repeat-screen-modal/RepeatScreenModalComponent.tsx
index 980bbfe9..d5490467 100644
--- a/frontend/lib/registry/components/repeat-screen-modal/RepeatScreenModalComponent.tsx
+++ b/frontend/lib/registry/components/repeat-screen-modal/RepeatScreenModalComponent.tsx
@@ -464,8 +464,17 @@ export function RepeatScreenModalComponent({
             // 조인 조건 생성
             const filters: Record<string, any> = {};
             for (const condition of dataSourceConfig.joinConditions) {
-              const refValue = representativeData[condition.referenceKey];
+              let refValue = representativeData[condition.referenceKey];
               if (refValue !== undefined && refValue !== null) {
+                // 숫자형 ID인 경우 숫자로 변환 (문자열 '189' → 숫자 189)
+                // 백엔드에서 entity 타입 컬럼 검색 시 문자열이면 ILIKE 검색을 수행하므로
+                // 정확한 ID 매칭을 위해 숫자로 변환해야 함
+                if (condition.sourceKey.endsWith('_id') || condition.sourceKey === 'id') {
+                  const numValue = Number(refValue);
+                  if (!isNaN(numValue)) {
+                    refValue = numValue;
+                  }
+                }
                 filters[condition.sourceKey] = refValue;
               }
             }
@@ -475,6 +484,14 @@ export function RepeatScreenModalComponent({
               continue;
             }
 
+            console.log(`[RepeatScreenModal] 외부 테이블 API 호출:`, {
+              sourceTable: dataSourceConfig.sourceTable,
+              filters,
+              joinConditions: dataSourceConfig.joinConditions,
+              representativeDataId: representativeData.id,
+              representativeDataIdType: typeof representativeData.id,
+            });
+
             // API 호출 - 메인 테이블 데이터
             const response = await apiClient.post(
               `/table-management/tables/${dataSourceConfig.sourceTable}/data`,