---
title: 1021: Not available. | API Docs
description: A declared field or part is not available yet.
---

**HTTP status:** `422`. May also be reported as a field-level finding in `error.details[]`.

A reserved field or part you supplied has no implementation yet and is refused rather than ignored, so a value you expected to take effect can never quietly fail to. It appears in details\[] under a 422 refusal.

## Troubleshooting

- Remove the reserved field or part named by details\[].param.

## Related

- [Part schemas](/channel/whatsapp/api/resources/contract/methods/part_schema/index.md)