diff --git a/services/resourcemanager/src/stackit/resourcemanager/api_client.py b/services/resourcemanager/src/stackit/resourcemanager/api_client.py
index 927e1dec6..04793ba2c 100644
--- a/services/resourcemanager/src/stackit/resourcemanager/api_client.py
+++ b/services/resourcemanager/src/stackit/resourcemanager/api_client.py
@@ -81,7 +81,7 @@ def __init__(self, configuration, header_name=None, header_value=None, cookie=No
             self.default_headers[header_name] = header_value
         self.cookie = cookie
         # Set default User-Agent.
-        self.user_agent = "OpenAPI-Generator/1.0.0/python"
+        self.user_agent = "stackit-sdk-python/resourcemanager"
 
     def __enter__(self):
         return self
diff --git a/services/resourcemanager/src/stackit/resourcemanager/models/parent_list_inner.py b/services/resourcemanager/src/stackit/resourcemanager/models/parent_list_inner.py
index 04584d7fb..6c9d1457b 100644
--- a/services/resourcemanager/src/stackit/resourcemanager/models/parent_list_inner.py
+++ b/services/resourcemanager/src/stackit/resourcemanager/models/parent_list_inner.py
@@ -29,13 +29,16 @@ class ParentListInner(BaseModel):
     container_id: StrictStr = Field(
         description="User-friendly identifier of either organization or folder (will replace id).", alias="containerId"
     )
-    container_parent_id: StrictStr = Field(
+    container_parent_id: Optional[StrictStr] = Field(
+        default=None,
         description="User-friendly parent identifier of either organization or folder (will replace parentId).",
         alias="containerParentId",
     )
     id: StrictStr = Field(description="Identifier.")
     name: StrictStr = Field(description="Parent container name.")
-    parent_id: StrictStr = Field(description="Identifier of the parent resource container.", alias="parentId")
+    parent_id: Optional[StrictStr] = Field(
+        default=None, description="Identifier of the parent resource container.", alias="parentId"
+    )
     type: StrictStr = Field(description="Parent container type.")
     __properties: ClassVar[List[str]] = ["containerId", "containerParentId", "id", "name", "parentId", "type"]