diff --git a/api/v1/swagger/definitions/preservation_train_item.yaml b/api/v1/swagger/definitions/preservation_train_item.yaml
index dda950cae5..b073ce245a 100644
--- a/api/v1/swagger/definitions/preservation_train_item.yaml
+++ b/api/v1/swagger/definitions/preservation_train_item.yaml
@@ -27,8 +27,10 @@ properties:
     type:
       - array
       - "null"
+  catalogue_item:
+    description: xxx
+    type:
+      - object
+      - "null"
 
 additionalProperties: false
-required:
-  - train_id
-  - processing_id
diff --git a/api/v1/swagger/paths/preservation_waiting_list.yaml b/api/v1/swagger/paths/preservation_waiting_list.yaml
index 951063b7b6..73b9350292 100644
--- a/api/v1/swagger/paths/preservation_waiting_list.yaml
+++ b/api/v1/swagger/paths/preservation_waiting_list.yaml
@@ -130,12 +130,6 @@
     x-koha-authorization:
       permissions:
         preservation: 1
-        description: |
-          Internal server error. Possible `error_code` attribute values:
-
-          * `internal_server_error`
-        schema:
-          $ref: "../swagger.yaml#/definitions/error"
 /preservation/waiting-list/items/{item_id}:
   delete:
     x-mojo-to: Preservation::WaitingList#remove_item