diff --git a/backend/app/services/task_service.py b/backend/app/services/task_service.py
index 5a23a1d..3224e14 100644
--- a/backend/app/services/task_service.py
+++ b/backend/app/services/task_service.py
@@ -46,7 +46,7 @@ async def _recalc_product_location(
     优先级：
       WIP > PENDING > COMPLETED/ARCHIVED > None
     """
-    from sqlalchemy import select as sa_select, case as sa_case, func as sa_func
+    from sqlalchemy import select as sa_select, case as sa_case, or_ as sa_or_
 
     product_result = await db.execute(
         sa_select(Product).where(Product.id == product_id)
@@ -60,7 +60,7 @@ async def _recalc_product_location(
         sa_select(Task)
         .where(
             Task.product_id == product_id,
-            sa_func.or_(
+            sa_or_(
                 Task.parent_task_id.is_(None),
                 Task.task_type.in_(["TRANSFER", "RECOVERY"]),
             ),