diff --git a/src/main/java/com/spring/modules/quote/service/impl/QuoteDetailBomTreeServiceImpl.java b/src/main/java/com/spring/modules/quote/service/impl/QuoteDetailBomTreeServiceImpl.java
index 1d942a24..dd8967ec 100644
--- a/src/main/java/com/spring/modules/quote/service/impl/QuoteDetailBomTreeServiceImpl.java
+++ b/src/main/java/com/spring/modules/quote/service/impl/QuoteDetailBomTreeServiceImpl.java
@@ -75,19 +75,24 @@ public class QuoteDetailBomTreeServiceImpl extends ServiceImpl<QuoteDetailBomTre
             // 顶级物料强制使用 Manufacturing 类型
             detail.setBomType("Manufacturing");
         }else {
-            // 子物料根据物料类型来确定BOM类型
+            // 子物料：先查询物料信息
             PartInformationEntity part = baseMapper.queryPart(detail.getSite(),detail.getPartNo());
             if (Objects.nonNull(part) && "Y".equals(part.getStatus())){
                 detail.setPartNo(part.getPartNo());
             }
-            // 查询物料类型，根据物料类型设置BOM类型
-            String partType = baseMapper.queryPartType(detail.getSite(), detail.getPartNo());
-            if ("Manufactured".equals(partType) || "Manufactured Recipe".equals(partType)) {
-                detail.setBomType("Manufacturing");
-            } else if ("Purchased".equals(partType)) {
-                detail.setBomType("Purchase");
+            // 只有在bomType为空时（新增报价单场景），才根据物料类型自动设置BOM类型
+            // 切换版本时，bomType已经由用户选择，保留用户的选择
+            if (detail.getBomType() == null || detail.getBomType().isEmpty()) {
+                String partType = baseMapper.queryPartType(detail.getSite(), detail.getPartNo());
+                if ("Manufactured".equals(partType) || "Manufactured Recipe".equals(partType)) {
+                    detail.setBomType("Manufacturing");
+                } else if ("Purchased".equals(partType)) {
+                    detail.setBomType("Purchase");
+                }
+                log.info("子物料 {} 的物料类型为 {}，BOM类型自动设置为 {}", detail.getPartNo(), partType, detail.getBomType());
+            } else {
+                log.info("子物料 {} 使用用户选择的BOM类型 {}", detail.getPartNo(), detail.getBomType());
             }
-            log.info("子物料 {} 的物料类型为 {}，BOM类型设置为 {}", detail.getPartNo(), partType, detail.getBomType());
         }
         // 获取BOM信息
         QuoteDetailBomTree bom =  baseMapper.queryPartBom(detail);