diff --git a/aucma-base/src/main/java/com/aucma/base/domain/OrderBomInfo.java b/aucma-base/src/main/java/com/aucma/base/domain/OrderBomInfo.java
index 23a35a6..a8ae1c8 100644
--- a/aucma-base/src/main/java/com/aucma/base/domain/OrderBomInfo.java
+++ b/aucma-base/src/main/java/com/aucma/base/domain/OrderBomInfo.java
@@ -53,6 +53,14 @@ public class OrderBomInfo extends TreeStringEntity {
     @Excel(name = "父物料编号")
     private String parentId;
 
+    /**
+     * 父级BOM节点主键
+     *
+     * 业务上同一个物料编码可能出现在多条BOM分支中，新增子节点时必须记录
+     * “挂在哪一条父节点记录下面”，否则仅靠 parentId 会把祖级链算错。
+     */
+    private Long parentObjId;
+
     /**
      * 父物料名称
      */
@@ -152,6 +160,14 @@ public class OrderBomInfo extends TreeStringEntity {
         this.parentName = parentName;
     }
 
+    public Long getParentObjId() {
+        return parentObjId;
+    }
+
+    public void setParentObjId(Long parentObjId) {
+        this.parentObjId = parentObjId;
+    }
+
     public String getParentMaterialType() {
         return parentMaterialType;
     }
@@ -300,6 +316,7 @@ public class OrderBomInfo extends TreeStringEntity {
                 .append("materialType", getMaterialType())
                 .append("standardAmount", getStandardAmount())
                 .append("parentId", getParentId())
+                .append("parentObjId", getParentObjId())
                 .append("isFlag", getIsFlag())
                 .append("createdBy", getCreatedBy())
                 .append("createdTime", getCreatedTime())
diff --git a/aucma-base/src/main/java/com/aucma/base/service/impl/OrderBomInfoServiceImpl.java b/aucma-base/src/main/java/com/aucma/base/service/impl/OrderBomInfoServiceImpl.java
index b5d97c4..091d23c 100644
--- a/aucma-base/src/main/java/com/aucma/base/service/impl/OrderBomInfoServiceImpl.java
+++ b/aucma-base/src/main/java/com/aucma/base/service/impl/OrderBomInfoServiceImpl.java
@@ -2,6 +2,7 @@ package com.aucma.base.service.impl;
 
 import java.util.List;
 
+import com.aucma.common.exception.base.BaseException;
 import com.aucma.common.utils.DateUtils;
 import com.aucma.common.utils.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -55,8 +56,10 @@ public class OrderBomInfoServiceImpl implements IOrderBomInfoService
     @Override
     public int insertOrderBomInfo(OrderBomInfo orderBomInfo)
     {
-        // 当前业务改为手工维护父子关系，这里只维护树查询必需的祖级链，不再做任何跨模块同步。
-        orderBomInfo.setAncestors(buildManualAncestors(orderBomInfo.getParentId(), orderBomInfo.getMaterialCode()));
+        // 当前业务改为手工维护父子关系。这里先把父节点唯一定位到具体 BOM 记录，
+        // 避免同一物料编码出现在多个分支时，祖级链被挂到错误的父节点上。
+        normalizeParentNode(orderBomInfo);
+        orderBomInfo.setAncestors(buildManualAncestors(orderBomInfo));
         orderBomInfo.setCreatedTime(DateUtils.getNowDate());
         return orderBomInfoMapper.insertOrderBomInfo(orderBomInfo);
     }
@@ -71,7 +74,8 @@ public class OrderBomInfoServiceImpl implements IOrderBomInfoService
     public int updateOrderBomInfo(OrderBomInfo orderBom)
     {
         OrderBomInfo oldBomInfo = orderBomInfoMapper.selectOrderBomInfoByObjId(orderBom.getObjId());
-        String newAncestors = buildManualAncestors(orderBom.getParentId(), orderBom.getMaterialCode());
+        normalizeParentNode(orderBom);
+        String newAncestors = buildManualAncestors(orderBom);
         orderBom.setAncestors(newAncestors);
         if (StringUtils.isNotNull(oldBomInfo) && StringUtils.isNotEmpty(oldBomInfo.getAncestors()))
         {
@@ -89,13 +93,28 @@ public class OrderBomInfoServiceImpl implements IOrderBomInfoService
      * @param materialCode 当前物料编号
      * @return 祖级链
      */
-    private String buildManualAncestors(String parentId, String materialCode)
+    private String buildManualAncestors(OrderBomInfo orderBomInfo)
     {
+        String parentId = orderBomInfo.getParentId();
+        String materialCode = orderBomInfo.getMaterialCode();
         // 根节点直接以自身编码作为祖级，便于前端按成品或顶层节点筛子树。
         if (isRootNode(parentId))
         {
             return materialCode;
         }
+        if (StringUtils.isNotNull(orderBomInfo.getParentObjId()) && orderBomInfo.getParentObjId() > 0L)
+        {
+            OrderBomInfo parentBomInfo = orderBomInfoMapper.selectOrderBomInfoByObjId(orderBomInfo.getParentObjId());
+            if (StringUtils.isNull(parentBomInfo))
+            {
+                throw new BaseException("父级BOM节点不存在，无法维护当前BOM结构");
+            }
+            if (StringUtils.isNotEmpty(parentBomInfo.getAncestors()))
+            {
+                return parentBomInfo.getAncestors() + "," + materialCode;
+            }
+            return parentBomInfo.getMaterialCode() + "," + materialCode;
+        }
         OrderBomInfo parentBomInfo = orderBomInfoMapper.selectOrderBomInfoByMaterialCode(parentId);
         if (StringUtils.isNotNull(parentBomInfo) && StringUtils.isNotEmpty(parentBomInfo.getAncestors()))
         {
@@ -116,6 +135,34 @@ public class OrderBomInfoServiceImpl implements IOrderBomInfoService
         return StringUtils.isEmpty(parentId) || "0".equals(parentId);
     }
 
+    /**
+     * 根据前端传入的父节点主键回填父物料编码
+     *
+     * 订单BOM允许同一物料编码出现在多条分支下，所以保存前必须把 parentObjId
+     * 解析成确定的父节点记录，再反填 parentId，避免后续查询仍然退化成模糊匹配。
+     *
+     * @param orderBomInfo 当前待保存BOM
+     */
+    private void normalizeParentNode(OrderBomInfo orderBomInfo)
+    {
+        if (StringUtils.isNull(orderBomInfo.getParentObjId()) || orderBomInfo.getParentObjId() <= 0L)
+        {
+            if (isRootNode(orderBomInfo.getParentId()))
+            {
+                orderBomInfo.setParentObjId(0L);
+                orderBomInfo.setParentId("0");
+            }
+            return;
+        }
+        OrderBomInfo parentBomInfo = orderBomInfoMapper.selectOrderBomInfoByObjId(orderBomInfo.getParentObjId());
+        if (StringUtils.isNull(parentBomInfo))
+        {
+            throw new BaseException("父级BOM节点不存在，无法维护当前BOM结构");
+        }
+        // 统一以父节点真实物料编码落库，兼容历史查询和列表展示。
+        orderBomInfo.setParentId(parentBomInfo.getMaterialCode());
+    }
+
     /**
      * 修改子元素关系
      *
diff --git a/aucma-base/src/main/resources/mapper/base/OrderBomInfoMapper.xml b/aucma-base/src/main/resources/mapper/base/OrderBomInfoMapper.xml
index ac3ce47..7e4a22a 100644
--- a/aucma-base/src/main/resources/mapper/base/OrderBomInfoMapper.xml
+++ b/aucma-base/src/main/resources/mapper/base/OrderBomInfoMapper.xml
@@ -12,6 +12,7 @@
         <result property="materialType" column="material_type"/>
         <result property="standardAmount" column="standard_amount"/>
         <result property="parentId" column="parent_id"/>
+        <result property="parentObjId" column="parent_obj_id"/>
         <result property="isFlag" column="is_flag"/>
         <result property="createdBy" column="created_by"/>
         <result property="createdTime" column="created_time"/>
@@ -34,6 +35,7 @@
                bm.MATERIAL_SUBCLASS material_type,
                ob.standard_amount,
                ob.parent_id,
+               ob.parent_obj_id,
                mp.MATERIAL_NAME     parentName,
                mp.MATERIAL_SUBCLASS parentMaterialType,
                ob.is_flag,
@@ -100,6 +102,7 @@
             <if test="materialType != null">material_type,</if>
             <if test="standardAmount != null">standard_amount,</if>
             <if test="parentId != null">parent_id,</if>
+            <if test="parentObjId != null">parent_obj_id,</if>
             <if test="isFlag != null">is_flag,</if>
             <if test="createdBy != null">created_by,</if>
             <if test="createdTime != null">created_time,</if>
@@ -119,6 +122,7 @@
             <if test="materialType != null">#{materialType},</if>
             <if test="standardAmount != null">#{standardAmount},</if>
             <if test="parentId != null">#{parentId},</if>
+            <if test="parentObjId != null">#{parentObjId},</if>
             <if test="isFlag != null">#{isFlag},</if>
             <if test="createdBy != null">#{createdBy},</if>
             <if test="createdTime != null">#{createdTime},</if>
@@ -141,6 +145,7 @@
             <if test="materialType != null">material_type = #{materialType},</if>
             <if test="standardAmount != null">standard_amount = #{standardAmount},</if>
             <if test="parentId != null">parent_id = #{parentId},</if>
+            <if test="parentObjId != null">parent_obj_id = #{parentObjId},</if>
             <if test="isFlag != null">is_flag = #{isFlag},</if>
             <if test="createdBy != null">created_by = #{createdBy},</if>
             <if test="createdTime != null">created_time = #{createdTime},</if>