diff --git a/backend-node/src/services/masterDetailExcelService.ts b/backend-node/src/services/masterDetailExcelService.ts
index 4b1a7218..0c1dfafe 100644
--- a/backend-node/src/services/masterDetailExcelService.ts
+++ b/backend-node/src/services/masterDetailExcelService.ts
@@ -47,8 +47,13 @@ export interface SplitPanelConfig {
     columns: Array<{ name: string; label: string; width?: number }>;
     relation?: {
       type: string;
-      foreignKey: string;
-      leftColumn: string;
+      foreignKey?: string;
+      leftColumn?: string;
+      // 복합키 지원 (새로운 방식)
+      keys?: Array<{
+        leftColumn: string;
+        rightColumn: string;
+      }>;
     };
   };
 }
@@ -210,8 +215,21 @@ class MasterDetailExcelService {
       }
 
       // 2. 분할 패널의 relation 정보가 있으면 우선 사용
-      let masterKeyColumn = splitPanel.rightPanel.relation?.leftColumn;
-      let detailFkColumn = splitPanel.rightPanel.relation?.foreignKey;
+      // 🔥 keys 배열을 우선 사용 (새로운 복합키 지원 방식)
+      let masterKeyColumn: string | undefined;
+      let detailFkColumn: string | undefined;
+      
+      const relationKeys = splitPanel.rightPanel.relation?.keys;
+      if (relationKeys && relationKeys.length > 0) {
+        // keys 배열에서 첫 번째 키 사용
+        masterKeyColumn = relationKeys[0].leftColumn;
+        detailFkColumn = relationKeys[0].rightColumn;
+        logger.info(`keys 배열에서 관계 정보 사용: ${masterKeyColumn} -> ${detailFkColumn}`);
+      } else {
+        // 하위 호환성: 기존 leftColumn/foreignKey 사용
+        masterKeyColumn = splitPanel.rightPanel.relation?.leftColumn;
+        detailFkColumn = splitPanel.rightPanel.relation?.foreignKey;
+      }
 
       // 3. relation 정보가 없으면 column_labels에서 Entity 관계 조회
       if (!masterKeyColumn || !detailFkColumn) {
diff --git a/frontend/lib/utils/buttonActions.ts b/frontend/lib/utils/buttonActions.ts
index 182e0cdc..f03774f1 100644
--- a/frontend/lib/utils/buttonActions.ts
+++ b/frontend/lib/utils/buttonActions.ts
@@ -4858,6 +4858,10 @@ export class ButtonActionExecutor {
               detailTable: relationResponse.data.detailTable,
               masterKeyColumn: relationResponse.data.masterKeyColumn,
               detailFkColumn: relationResponse.data.detailFkColumn,
+              // 채번 규칙 ID 추가 (excelNumberingRuleId를 numberingRuleId로 매핑)
+              numberingRuleId: config.masterDetailExcel.numberingRuleId || config.excelNumberingRuleId,
+              // 업로드 후 제어 설정 추가
+              afterUploadFlows: config.masterDetailExcel.afterUploadFlows || config.excelAfterUploadFlows,
             };
           } else {
             // 버튼 설정이 없으면 분할 패널 정보만 사용
@@ -4867,6 +4871,10 @@ export class ButtonActionExecutor {
               masterKeyColumn: relationResponse.data.masterKeyColumn,
               detailFkColumn: relationResponse.data.detailFkColumn,
               simpleMode: true, // 기본값으로 간단 모드 사용
+              // 채번 규칙 ID 추가 (excelNumberingRuleId 사용)
+              numberingRuleId: config.excelNumberingRuleId,
+              // 업로드 후 제어 설정 추가
+              afterUploadFlows: config.excelAfterUploadFlows,
             };
           }