diff --git a/src/main/java/com/palnet/biz/api/acnt/cstmr/service/AcntCstmrService.java b/src/main/java/com/palnet/biz/api/acnt/cstmr/service/AcntCstmrService.java
index acf3a5b..387fcdc 100644
--- a/src/main/java/com/palnet/biz/api/acnt/cstmr/service/AcntCstmrService.java
+++ b/src/main/java/com/palnet/biz/api/acnt/cstmr/service/AcntCstmrService.java
@@ -283,10 +283,12 @@ public class AcntCstmrService {
 					groupEntity.setUseYn("N");
 					ptyGroupBasRepository.save(groupEntity);
 				}
-			PtyCstmrGroup cstmrEntity = ptyCstmrGroupRepository.changeGroupJoinYn(group.getGroupId());
+			List<PtyCstmrGroup> cstmrEntity = ptyCstmrGroupRepository.changeGroupJoinYn(group.getGroupId());
 				if(!(cstmrEntity == null)) {
-					cstmrEntity.setJoinYn("N");
-					ptyCstmrGroupRepository.save(cstmrEntity);
+					for(PtyCstmrGroup cstmr : cstmrEntity) {
+						cstmr.setJoinYn("N");
+						ptyCstmrGroupRepository.save(cstmr);
+					}
 				}
 			}
 			List<PtyCstmrGroup> AprvlEntity = ptyCstmrGroupRepository.changeGroupAprvlYn(cstmrSno);
diff --git a/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java b/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java
index ab965ad..a16c27b 100644
--- a/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java
+++ b/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java
@@ -20,7 +20,7 @@ public interface PtyCstmrGroupRepository extends JpaRepository<PtyCstmrGroup, In
     
     @Query("select p from PtyCstmrGroup p " +
     		"where p.groupId = :groupId " )
-    PtyCstmrGroup changeGroupJoinYn(@Param("groupId") String groupId);
+    List<PtyCstmrGroup> changeGroupJoinYn(@Param("groupId") String groupId);
     
     @Query("select p from PtyCstmrGroup p " +
     		"where p.cstmrSno = :cstmrSno " )