diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index bd868f85..2b360925 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -1419,7 +1419,6 @@ class HandoverSerializer(CustomModelSerializer):
         next_mat = None
         next_state = None
         next_defect = None
-        next_defect_grade = None
         if new_wm and attrs["type"] != Handover.H_CHANGE:
             next_mat = new_wm.material
             next_state = new_wm.state
@@ -1440,15 +1439,10 @@ class HandoverSerializer(CustomModelSerializer):
                 if clear_defect and new_wm is not None and new_wm.defect is not None:
                     raise ParseError('清除批次缺陷时目标批次不能带缺陷')
                 if clear_defect and tracking == Material.MA_TRACKING_BATCH:
-                    if wm.defect is None:
+                    defect_grade = effective_defect_grade(wm, "notok_sign")
+                    if defect_grade not in [Defect.DEFECT_OK, Defect.DEFECT_OK_B]:
                         raise ParseError(
-                            f'第{ind+1}行-批次追踪物料仅同缺陷等级可清除批次缺陷'
-                        )
-                    if next_defect_grade is None:
-                        next_defect_grade = wm.defect.okcate
-                    elif next_defect_grade != wm.defect.okcate:
-                        raise ParseError(
-                            f'第{ind+1}行-批次追踪物料仅同缺陷等级可清除批次缺陷'
+                            f'第{ind+1}行-批次追踪物料仅合格品和合格B类可清除批次缺陷'
                         )
                 if next_mat is None:
                     next_mat = wm.material
diff --git a/apps/wpm/tests.py b/apps/wpm/tests.py
index 9ffaf96f..30d801cb 100644
--- a/apps/wpm/tests.py
+++ b/apps/wpm/tests.py
@@ -507,7 +507,34 @@ class WMaterialScopeTests(SimpleTestCase):
         self.assertTrue(validated["clear_defect"])
         self.assertEqual(validated["count"], 2)
 
-    def test_batch_tracking_merge_can_clear_same_grade_notok_defects(self):
+    def test_batch_tracking_merge_can_clear_ok_and_ok_b_defects(self):
+        material = Material(tracking=Material.MA_TRACKING_BATCH)
+        defect_b = Defect(id="1", okcate=Defect.DEFECT_OK_B)
+        wm_ok = WMaterial(
+            id="10", material=material, batch="OK-001", count=1,
+            state=WMaterial.WM_OK, defect=None,
+        )
+        wm_b = WMaterial(
+            id="20", material=material, batch="B-001", count=1,
+            state=WMaterial.WM_OK, defect=defect_b,
+        )
+
+        validated = HandoverSerializer().validate({
+            "wm": wm_ok,
+            "handoverb": [
+                {"wm": wm_ok, "count": 1},
+                {"wm": wm_b, "count": 1},
+            ],
+            "new_batch": "OK-MERGED",
+            "clear_defect": True,
+            "type": Handover.H_NORMAL,
+            "mtype": Handover.H_MERGE,
+        })
+
+        self.assertTrue(validated["clear_defect"])
+        self.assertEqual(validated["count"], 2)
+
+    def test_batch_tracking_merge_cannot_clear_same_grade_notok_defects(self):
         material = Material(tracking=Material.MA_TRACKING_BATCH)
         defect_a = Defect(id="1", okcate=Defect.DEFECT_NOTOK)
         defect_b = Defect(id="2", okcate=Defect.DEFECT_NOTOK)
@@ -520,20 +547,21 @@ class WMaterialScopeTests(SimpleTestCase):
             state=WMaterial.WM_NOTOK, defect=defect_b,
         )
 
-        validated = HandoverSerializer().validate({
-            "wm": wm_a,
-            "handoverb": [
-                {"wm": wm_a, "count": 1},
-                {"wm": wm_b, "count": 1},
-            ],
-            "new_batch": "N-MERGED",
-            "clear_defect": True,
-            "type": Handover.H_NORMAL,
-            "mtype": Handover.H_MERGE,
-        })
-
-        self.assertTrue(validated["clear_defect"])
-        self.assertEqual(validated["count"], 2)
+        with self.assertRaisesMessage(
+            ParseError,
+            "批次追踪物料仅合格品和合格B类可清除批次缺陷",
+        ):
+            HandoverSerializer().validate({
+                "wm": wm_a,
+                "handoverb": [
+                    {"wm": wm_a, "count": 1},
+                    {"wm": wm_b, "count": 1},
+                ],
+                "new_batch": "N-MERGED",
+                "clear_defect": True,
+                "type": Handover.H_NORMAL,
+                "mtype": Handover.H_MERGE,
+            })
 
     def test_batch_tracking_merge_cannot_clear_mixed_defect_grades(self):
         material = Material(tracking=Material.MA_TRACKING_BATCH)
@@ -550,7 +578,7 @@ class WMaterialScopeTests(SimpleTestCase):
 
         with self.assertRaisesMessage(
             ParseError,
-            "批次追踪物料仅同缺陷等级可清除批次缺陷",
+            "批次追踪物料仅合格品和合格B类可清除批次缺陷",
         ):
             HandoverSerializer().validate({
                 "wm": wm_a,