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 a20585b1..4d13c83a 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
@@ -403,22 +403,21 @@ public class QuoteDetailBomTreeServiceImpl extends ServiceImpl<QuoteDetailBomTre
                     doSaveBomDataRecursive(finalNodeData, finalDetail, 0L);
                 }
             }
-
-            // 2. 重新计算成本 (如果开启)
-            // 将其放在同一个事务中，如果计算失败，BOM 切换也会一并回滚，保证数据一致性
-            if (Boolean.TRUE.equals(tree.getRecalculateCost()) && finalDetail != null) {
-                log.info("[BOM_SWITCH] Recalculate cost is enabled, executing cost calculation for QuoteDetailId: {}", finalDetail.getId());
-                try {
-                    quoteDetailService.queryQuoteDetailCost(finalDetail);
-                    log.info("[BOM_SWITCH] Cost calculation completed successfully for QuoteDetailId: {}", finalDetail.getId());
-                } catch (Exception e) {
-                    log.error("[BOM_SWITCH] Cost calculation failed for QuoteDetailId: {}, Error: {}", finalDetail.getId(), e.getMessage(), e);
-                    // 抛出 RuntimeException 以触发 transactionTemplate 回滚
-                    throw new RuntimeException("成本计算失败: " + e.getMessage());
-                }
-            }
             return null;
         });
+
+        // 2. 重新计算成本 (如果开启)
+        // 移出事务外执行，避免长事务锁表导致其他用户无法查看/编辑条目明细
+        if (Boolean.TRUE.equals(tree.getRecalculateCost()) && finalDetail != null) {
+            log.info("[BOM_SWITCH] Recalculate cost is enabled, executing cost calculation for QuoteDetailId: {}", finalDetail.getId());
+            try {
+                quoteDetailService.queryQuoteDetailCost(finalDetail);
+                log.info("[BOM_SWITCH] Cost calculation completed successfully for QuoteDetailId: {}", finalDetail.getId());
+            } catch (Exception e) {
+                log.error("[BOM_SWITCH] Cost calculation failed for QuoteDetailId: {}, Error: {}", finalDetail.getId(), e.getMessage(), e);
+                throw new RuntimeException("BOM切换成功，但成本重新计算失败: " + e.getMessage());
+            }
+        }
     }
 
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