diff --git a/WebContent/WEB-INF/view/partMng/structurePopupCenter.jsp b/WebContent/WEB-INF/view/partMng/structurePopupCenter.jsp
index 3ec405d..b3d943a 100644
--- a/WebContent/WEB-INF/view/partMng/structurePopupCenter.jsp
+++ b/WebContent/WEB-INF/view/partMng/structurePopupCenter.jsp
@@ -65,7 +65,7 @@ function buildSubTreeFlatList(subTree, parentObjid, baseLevel) {
 		var originalChildObjid = item.CHILD_OBJID || item.child_objid || '';
 		if(originalChildObjid) originalChildToNew[originalChildObjid] = newChildObjid;
 		
-		flatList.push({
+		var subPartData = {
 			OBJID: generateTempId(),
 			CHILD_OBJID: newChildObjid,
 			PARENT_OBJID: parentObjid,
@@ -80,7 +80,11 @@ function buildSubTreeFlatList(subTree, parentObjid, baseLevel) {
 			REVISION: item.REVISION || item.revision || '',
 			STATUS: 'ACTIVE',
 			_IS_SUB_PART: true
-		});
+		};
+		for(var lv = 1; lv <= 10; lv++) {
+			subPartData['LEVEL_' + lv] = (lv == subPartData.LEVEL) ? '*' : '';
+		}
+		flatList.push(subPartData);
 	}
 	
 	// 2레벨 이상 항목의 부모 OBJID 재매핑
@@ -160,7 +164,7 @@ $(function(){
 			var rowData = rightSelectedRows[i].getData();
 			var partChildObjid = generateTempId();
 			
-			newParts.push({
+			var newPartData = {
 				OBJID: generateTempId(),
 				CHILD_OBJID: partChildObjid,
 				PARENT_OBJID: parentObjid,
@@ -174,7 +178,11 @@ $(function(){
 				SPEC: rowData.SPEC || '',
 				REVISION: rowData.REVISION || '',
 				STATUS: 'ACTIVE'
-			});
+			};
+			for(var lv = 1; lv <= 10; lv++) {
+				newPartData['LEVEL_' + lv] = (lv == newPartData.LEVEL) ? '*' : '';
+			}
+			newParts.push(newPartData);
 			
 			// 반제품 E-BOM 하위 구조 조회
 			var ebomResult = fetchEbomSubTree(rowData.PART_NO);
diff --git a/src/com/pms/service/PartMngService.java b/src/com/pms/service/PartMngService.java
index 044cbfc..836519f 100644
--- a/src/com/pms/service/PartMngService.java
+++ b/src/com/pms/service/PartMngService.java
@@ -3960,7 +3960,8 @@ public class PartMngService extends BaseService {
 				}
 			}
 
-			// 새 데이터에서 참조하는 PARENT_OBJID 셋 (삭제 보호용)
+			// 삭제 보호용: UI 새 데이터에서 참조되는 PARENT_OBJID만 수집
+			// (DB 기존 데이터는 포함하지 않음 - 의도적 삭제를 막게 되므로)
 			Set<String> referencedParentObjids = new HashSet<>();
 			for(Map<String, Object> item : ebomData) {
 				String parentObjid = CommonUtils.checkNull(item.get("parentObjid"));
@@ -3969,12 +3970,22 @@ public class PartMngService extends BaseService {
 				}
 			}
 			
-			// 2. 삭제: 기존에 있지만 새 데이터에 없는 항목 (다른 행이 참조하는 부모는 보호)
+			// 2. 삭제: 기존에 있지만 새 데이터에 없는 항목
 			for(String existingChildObjid : existingMap.keySet()) {
 				if(!newChildObjids.contains(existingChildObjid)) {
-					if(referencedParentObjids.contains(existingChildObjid)) {
+					// 루트 행(PARENT_OBJID 비어있음)은 절대 삭제하지 않음
+					Map<String, Object> existingRow = existingMap.get(existingChildObjid);
+					String existingParentObjid = CommonUtils.checkNull(existingRow.get("parent_objid"), CommonUtils.checkNull(existingRow.get("PARENT_OBJID")));
+					if(existingParentObjid.isEmpty()) {
+						System.out.println("[saveEbomBatch] 루트 행 삭제 방지: CHILD_OBJID=" + existingChildObjid);
 						continue;
 					}
+					// 다른 행이 이 CHILD_OBJID를 부모로 참조하면 삭제 방지
+					if(referencedParentObjids.contains(existingChildObjid)) {
+						System.out.println("[saveEbomBatch] 참조된 부모 행 삭제 방지: CHILD_OBJID=" + existingChildObjid);
+						continue;
+					}
+					System.out.println("[saveEbomBatch] 삭제: CHILD_OBJID=" + existingChildObjid);
 					Map<String, Object> deleteParam = new HashMap<>();
 					deleteParam.put("bomReportObjId", bomReportObjId);
 					deleteParam.put("childObjid", existingChildObjid);
@@ -3982,29 +3993,43 @@ public class PartMngService extends BaseService {
 				}
 			}
 			
-			// 3. 추가/수정
+			// 3. 추가/수정 (임시ID → 새ID 매핑으로 부모-자식 관계 유지)
+			Map<String, String> tempIdToNewIdMap = new HashMap<>();
+			
 			for(int i = 0; i < ebomData.size(); i++) {
 				Map<String, Object> item = ebomData.get(i);
 				String childObjid = CommonUtils.checkNull(item.get("childObjid"));
 				
 				if(existingMap.containsKey(childObjid)) {
 					// 기존 항목 → 수정 (수량, 순서 등만 업데이트)
+					String parentObjid = CommonUtils.checkNull(item.get("parentObjid"));
+					// 부모가 임시ID였다면 새 ID로 치환
+					if(!parentObjid.isEmpty() && tempIdToNewIdMap.containsKey(parentObjid)) {
+						parentObjid = tempIdToNewIdMap.get(parentObjid);
+					}
 					Map<String, Object> updateParam = new HashMap<>();
 					updateParam.put("bomReportObjId", bomReportObjId);
 					updateParam.put("childObjid", childObjid);
-					updateParam.put("PARENT_OBJID", CommonUtils.checkNull(item.get("parentObjid")));
+					updateParam.put("PARENT_OBJID", parentObjid);
 					updateParam.put("QTY", CommonUtils.checkNull(item.get("qty"), "1"));
 					updateParam.put("ITEM_QTY", CommonUtils.checkNull(item.get("itemQty"), "1"));
 					updateParam.put("QTY_TEMP", CommonUtils.checkNull(item.get("qtyTemp"), "1"));
 					updateParam.put("SEQ", i + 1);
 					sqlSession.update("partMng.updateBomPartQtyByChildObjid", updateParam);
 				} else {
-					// 신규 항목 → INSERT
+					// 신규 항목 → INSERT (항상 새 CHILD_OBJID 생성, 매핑 추적)
+					String newChildObjid = CommonUtils.createObjId();
+					tempIdToNewIdMap.put(childObjid, newChildObjid);
+					String parentObjid = CommonUtils.checkNull(item.get("parentObjid"));
+					// 부모가 임시ID였다면 새 ID로 치환
+					if(!parentObjid.isEmpty() && tempIdToNewIdMap.containsKey(parentObjid)) {
+						parentObjid = tempIdToNewIdMap.get(parentObjid);
+					}
 					Map<String, Object> insertParam = new HashMap<>();
 					insertParam.put("BOM_REPORT_OBJID", bomReportObjId);
 					insertParam.put("OBJID", CommonUtils.createObjId());
-					insertParam.put("PARENT_OBJID", CommonUtils.checkNull(item.get("parentObjid")));
-					insertParam.put("CHILD_OBJID", childObjid.startsWith("-") ? CommonUtils.createObjId() : childObjid);
+					insertParam.put("PARENT_OBJID", parentObjid);
+					insertParam.put("CHILD_OBJID", newChildObjid);
 					insertParam.put("PARENT_PART_NO", CommonUtils.checkNull(item.get("parentPartNo")));
 					insertParam.put("PART_NO", CommonUtils.checkNull(item.get("partNo")));
 					insertParam.put("LAST_PART_OBJID", CommonUtils.checkNull(item.get("lastPartObjid")));