diff --git a/.gitignore b/.gitignore
index 197ad216..fb843160 100644
--- a/.gitignore
+++ b/.gitignore
@@ -191,3 +191,6 @@ mcp-task-queue/
 .cursor/rules/multi-agent-tester.mdc
 .cursor/rules/multi-agent-reviewer.mdc
 .cursor/rules/multi-agent-knowledge.mdc
+
+# 파이프라인 회고록 (자동 생성)
+docs/retrospectives/
diff --git a/frontend/components/common/ExcelUploadModal.tsx b/frontend/components/common/ExcelUploadModal.tsx
index d3a4b187..601d44fc 100644
--- a/frontend/components/common/ExcelUploadModal.tsx
+++ b/frontend/components/common/ExcelUploadModal.tsx
@@ -97,10 +97,23 @@ export interface ExcelUploadModalProps {
 interface ColumnMapping {
   excelColumn: string;
   systemColumn: string | null;
-  // 중복 체크 설정 (해당 컬럼을 중복 체크 키로 사용할지)
   checkDuplicate?: boolean;
 }
 
+function flattenCategoryValues(
+  values: Array<{ valueCode: string; valueLabel: string; children?: any[] }>
+): Array<{ valueCode: string; valueLabel: string }> {
+  const result: Array<{ valueCode: string; valueLabel: string }> = [];
+  const traverse = (items: any[]) => {
+    for (const item of items) {
+      result.push({ valueCode: item.valueCode, valueLabel: item.valueLabel });
+      if (item.children?.length > 0) traverse(item.children);
+    }
+  };
+  traverse(values);
+  return result;
+}
+
 export const ExcelUploadModal: React.FC<ExcelUploadModalProps> = ({
   open,
   onOpenChange,
@@ -681,12 +694,8 @@ export const ExcelUploadModal: React.FC<ExcelUploadModalProps> = ({
         const valuesResponse = await getCategoryValues(targetTableName, catCol.systemCol);
         if (!valuesResponse.success || !valuesResponse.data) continue;
 
-        const validValues = valuesResponse.data as Array<{
-          valueCode: string;
-          valueLabel: string;
-        }>;
+        const validValues = flattenCategoryValues(valuesResponse.data as any[]);
 
-        // 유효한 코드와 라벨 Set 생성
         const validCodes = new Set(validValues.map((v) => v.valueCode));
         const validLabels = new Set(validValues.map((v) => v.valueLabel));
         const validLabelsLower = new Set(validValues.map((v) => v.valueLabel.toLowerCase()));
diff --git a/frontend/components/common/MultiTableExcelUploadModal.tsx b/frontend/components/common/MultiTableExcelUploadModal.tsx
index f6d11ae9..9541a13d 100644
--- a/frontend/components/common/MultiTableExcelUploadModal.tsx
+++ b/frontend/components/common/MultiTableExcelUploadModal.tsx
@@ -51,6 +51,20 @@ interface ColumnMapping {
   targetColumn: string | null;
 }
 
+function flattenCategoryValues(
+  values: Array<{ valueCode: string; valueLabel: string; children?: any[] }>
+): Array<{ valueCode: string; valueLabel: string }> {
+  const result: Array<{ valueCode: string; valueLabel: string }> = [];
+  const traverse = (items: any[]) => {
+    for (const item of items) {
+      result.push({ valueCode: item.valueCode, valueLabel: item.valueLabel });
+      if (item.children?.length > 0) traverse(item.children);
+    }
+  };
+  traverse(values);
+  return result;
+}
+
 export const MultiTableExcelUploadModal: React.FC<MultiTableExcelUploadModalProps> = ({
   open,
   onOpenChange,
@@ -356,10 +370,7 @@ export const MultiTableExcelUploadModal: React.FC<MultiTableExcelUploadModalProp
           const valuesResponse = await getCategoryValues(level.tableName, catColName);
           if (!valuesResponse.success || !valuesResponse.data) continue;
 
-          const validValues = valuesResponse.data as Array<{
-            valueCode: string;
-            valueLabel: string;
-          }>;
+          const validValues = flattenCategoryValues(valuesResponse.data as any[]);
 
           const validCodes = new Set(validValues.map((v) => v.valueCode));
           const validLabels = new Set(validValues.map((v) => v.valueLabel));