diff --git a/unilabos/devices/liquid_handling/prcxi/prcxi.py b/unilabos/devices/liquid_handling/prcxi/prcxi.py
index ba3ff6a..446d03c 100644
--- a/unilabos/devices/liquid_handling/prcxi/prcxi.py
+++ b/unilabos/devices/liquid_handling/prcxi/prcxi.py
@@ -364,8 +364,8 @@ class PRCXI9300TubeRack(TubeRack):
     def __init__(self, name: str, size_x: float, size_y: float, size_z: float, 
                  category: str = "tube_rack", 
                  items: Optional[Dict[str, Any]] = None,
-                 ordered_items: Optional[OrderedDict] = None,
-                 ordering: Optional[OrderedDict] = None,
+                 ordered_items: collections.OrderedDict = None, 
+                 ordering: Optional[collections.OrderedDict] = None,
                  model: Optional[str] = None,
                  material_info: Optional[Dict[str, Any]] = None, 
                  **kwargs):
@@ -380,7 +380,7 @@ class PRCXI9300TubeRack(TubeRack):
                 # ordering 的值是字符串，这种情况下我们让 TubeRack 使用默认行为
                 # 不在初始化时创建 items，而是在 deserialize 后处理
                 items_to_pass = None
-                ordering_param = collections.OrderedDict()  # 提供空的 ordering 来满足要求
+                ordering_param = collections.OrderedDict((k, None) for k in ordering.keys())  # 提供空的 ordering 来满足要求
                 # 保存 ordering 信息以便后续处理
                 self._temp_ordering = ordering
             else:
diff --git a/unilabos/ros/nodes/base_device_node.py b/unilabos/ros/nodes/base_device_node.py
index c248882..d8e3f87 100644
--- a/unilabos/ros/nodes/base_device_node.py
+++ b/unilabos/ros/nodes/base_device_node.py
@@ -1468,6 +1468,8 @@ class BaseROS2DeviceNode(Node, Generic[T]):
                             if isinstance(rs, list):
                                 for r in rs:
                                     res = self.resource_tracker.parent_resource(r)  # 获取 resource 对象
+                            elif type(rs).__name__ == "ResourceHolder":
+                                pass
                             else:
                                 res = self.resource_tracker.parent_resource(rs)
                             if id(res) not in seen:
diff --git a/unilabos/test/experiments/prcxi_9320_with_res_test.json b/unilabos/test/experiments/prcxi_9320_with_res_test.json
index bcb5b08..e7b18d9 100644
--- a/unilabos/test/experiments/prcxi_9320_with_res_test.json
+++ b/unilabos/test/experiments/prcxi_9320_with_res_test.json
@@ -16283,7 +16283,7 @@
           "size_y": 85.8,
           "size_z": 42.66,
           "barcode": null,
-          "category": null,
+          "category": "tube_rack",
           "ordering": {
               "A1": "PlateT6_0_0",
               "A2": "PlateT6_1_0",