diff --git a/src/com/pms/mapper/approval.xml b/src/com/pms/mapper/approval.xml
index 667ec60..2a2d6b4 100644
--- a/src/com/pms/mapper/approval.xml
+++ b/src/com/pms/mapper/approval.xml
@@ -643,15 +643,11 @@
 		)
 	</insert>
 	
-	<!-- 기존 매핑의 APPRO_KEY 갱신 (재상신 시) -->
+	<!-- 기존 매핑 갱신 (재상신 시 - approKey는 유지) -->
 	<update id="updateAmaranthApprovalResubmit" parameterType="map">
 		UPDATE AMARANTH_APPROVAL SET 
-			APPRO_KEY = #{approKey},
 			APPROVAL_TITLE = #{approvalTitle},
 			WRITER = #{writer},
-			STATUS = 'create',
-			AMARANTH_DOC_ID = NULL,
-			DOC_STS = '0',
 			UPDATE_DATE = NOW()
 		WHERE TARGET_OBJID = #{targetObjId} AND TARGET_TYPE = #{targetType}
 	</update>
diff --git a/src/com/pms/service/ApprovalService.java b/src/com/pms/service/ApprovalService.java
index 0f1ce97..8eea2ae 100644
--- a/src/com/pms/service/ApprovalService.java
+++ b/src/com/pms/service/ApprovalService.java
@@ -1809,14 +1809,30 @@ public class ApprovalService {
 			String compSeq = CommonUtils.checkNull(paramMap.get("compSeq"), "1000");
 			String deptSeq = CommonUtils.checkNull(paramMap.get("deptSeq"));
 			
-			// approKey 생성: "UB_" + UUID (외부시스템과 결재문서 매핑 키)
-			String approKey = "UB_" + java.util.UUID.randomUUID().toString();
+			// DB에서 기존 매핑 조회 → 있으면 approKey 재사용, 없으면 신규 생성
+			sqlSession = SqlMapConfig.getInstance().getSqlSession(false);
+			Map<String, Object> mappingParam = new HashMap();
+			mappingParam.put("targetType", targetType);
+			mappingParam.put("targetObjId", targetObjId);
+			
+			Map<String, Object> existing = sqlSession.selectOne("approval.selectAmaranthApprovalByTarget", mappingParam);
+			existing = existing != null ? CommonUtils.toUpperCaseMapKey(existing) : null;
+			
+			String approKey;
+			boolean isNewRecord;
+			if(existing != null){
+				approKey = CommonUtils.checkNull(existing.get("APPRO_KEY"));
+				isNewRecord = false;
+				System.out.println("=== 기존 approKey 재사용: " + approKey + " ===");
+			} else {
+				approKey = "UB_" + java.util.UUID.randomUUID().toString();
+				isNewRecord = true;
+				System.out.println("=== 신규 approKey 생성: " + approKey + " ===");
+			}
 			
-			System.out.println("=== Amaranth SSO URL 생성 ===");
 			System.out.println("empSeq: " + empSeq + ", loginId: " + loginId);
 			System.out.println("targetType: " + targetType + ", targetObjId: " + targetObjId);
 			System.out.println("outProcessCode: " + outProcessCode + ", formId: " + formId);
-			System.out.println("approKey: " + approKey);
 			
 			// API 클라이언트 생성
 			com.pms.api.AmaranthApprovalApiClient apiClient = new com.pms.api.AmaranthApprovalApiClient();
@@ -1830,7 +1846,7 @@ public class ApprovalService {
 				fileEx.printStackTrace();
 			}
 			
-			// SSO URL 생성 API 호출
+			// SSO URL 생성 API 호출 (기존/신규 동일한 approKey 사용)
 			String apiResponse = apiClient.getSsoUrl(
 				AMARANTH_BASE_URL, empSeq, outProcessCode, formId,
 				approKey, approvalTitle, "W", compSeq, deptSeq, loginId, fileListEncoded
@@ -1843,22 +1859,17 @@ public class ApprovalService {
 			String resultCode = extractJsonStringValue(apiResponse, "resultCode");
 			
 			if("0".equals(resultCode) && !fullUrl.isEmpty()){
-				// approKey → targetObjId 매핑: 기존 건 있으면 UPDATE, 없으면 INSERT
-				sqlSession = SqlMapConfig.getInstance().getSqlSession(false);
-				Map<String, Object> mappingParam = new HashMap();
+				// 신규면 INSERT, 기존이면 UPDATE (제목/작성자만 갱신)
 				mappingParam.put("approKey", approKey);
-				mappingParam.put("targetType", targetType);
-				mappingParam.put("targetObjId", targetObjId);
 				mappingParam.put("approvalTitle", approvalTitle);
 				mappingParam.put("writer", loginId);
 				
-				Map<String, Object> existing = sqlSession.selectOne("approval.selectAmaranthApprovalByTarget", mappingParam);
-				if(existing != null){
-					sqlSession.update("approval.updateAmaranthApprovalResubmit", mappingParam);
-					System.out.println("Amaranth 결재 매핑 UPDATE - approKey: " + approKey);
-				} else {
+				if(isNewRecord){
 					sqlSession.insert("approval.insertAmaranthApproval", mappingParam);
 					System.out.println("Amaranth 결재 매핑 INSERT - approKey: " + approKey);
+				} else {
+					sqlSession.update("approval.updateAmaranthApprovalResubmit", mappingParam);
+					System.out.println("Amaranth 결재 매핑 UPDATE - approKey: " + approKey);
 				}
 				sqlSession.commit();