diff --git a/codegenerator/openapi/cinder_schemas/attachment.py b/codegenerator/openapi/cinder_schemas/attachment.py
index 775c862..0673c08 100644
--- a/codegenerator/openapi/cinder_schemas/attachment.py
+++ b/codegenerator/openapi/cinder_schemas/attachment.py
@@ -57,7 +57,7 @@ ATTACHMENT_DETAIL_SCHEMA: dict[str, Any] = {
         "attach_mode": {
             "type": "string",
             "description": "The attach mode of attachment, read-only (‘ro’) or read-and-write (‘rw’), default is ‘rw’.",
-            "enum": ["ro", "rw"],
+            "enum": ["null", "ro", "rw"],
             "x-openstack": {"min-ver": "3.54"},
         },
         "attached_at": {
diff --git a/codegenerator/openapi/cinder_schemas/volume.py b/codegenerator/openapi/cinder_schemas/volume.py
index b2f102a..3267885 100644
--- a/codegenerator/openapi/cinder_schemas/volume.py
+++ b/codegenerator/openapi/cinder_schemas/volume.py
@@ -145,7 +145,7 @@ VOLUME_SCHEMA: dict[str, Any] = {
             "description": "The date and time when the resource was updated.",
         },
         "replication_status": {
-            "type": "string",
+            "type": ["string", "null"],
             "description": "The volume replication status.",
         },
         "id": {
@@ -203,7 +203,6 @@ VOLUME_SCHEMA: dict[str, Any] = {
         "bootable",
         "encrypted",
         "id",
-        "migration_status",
         "name",
         "replication_status",
         "size",