diff --git a/apps/wpm/models.py b/apps/wpm/models.py
index bfd47df2..13c397fa 100644
--- a/apps/wpm/models.py
+++ b/apps/wpm/models.py
@@ -665,17 +665,15 @@ class BatchSt(BaseModel):
         """
         if mioitem:
             mio = mioitem.mio
-        try:
-            node = cls.objects.get(batch=batch, version=1)
-            if check_mat_start:
-                if node.material_start is None:
-                    node.material_start = material_start
-                    node.save(update_fields = ["material_start"])
-                if node.material_start != material_start:
-                    raise ParseError(f"{batch}-该批次号因物料不同不可引用")
-            return node, False
-        except cls.DoesNotExist:
-            return cls.objects.create(batch=batch, mio=mio, mioitem=mioitem, handover=handover, mlog=mlog, material_start=material_start, version=1), True
+        node, created = cls.safe_get_or_create(batch=batch, version=1, defaults={
+            "mio":mio, "mioitem":mioitem, "handover":handover, "mlog":mlog, "material_start":material_start})
+        if not created and check_mat_start:
+            if node.material_start is None:
+                node.material_start = material_start
+                node.save(update_fields = ["material_start"])
+            if node.material_start != material_start:
+                raise ParseError(f"{batch}-该批次号因物料不同不可引用")
+        return node, created
 
         # if mio is None and handover is None and mlog is None:
         #     try:
@@ -778,9 +776,15 @@ class BatchLog(BaseModel):
                     if target.mio is None and target.mioitem is None:
                         target.delete()
         if mio:
-            BatchSt.objects.filter(mio=mio).delete()
+            ts = BatchSt.objects.filter(mio=mio)
+            for t in ts:
+                if not BatchLog.objects.filter(Q(source=t) | Q(target=t)).exists():
+                    t.delete()
         if mioitem:
-            BatchSt.objects.filter(mioitem=mioitem).delete()
+            ts = BatchSt.objects.filter(mioitem=mioitem)
+            for t in ts:
+                if not BatchLog.objects.filter(Q(source=t) | Q(target=t)).exists():
+                    t.delete()
 
     @classmethod
     def batches_to(cls, batch:str):