---
title: 1009: Field not allowed. | API Docs
description: A field valid on this part type in general is not allowed in this shape.
---

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

The field at param exists on the part type but is not permitted in this particular shape (for example a caption on audio or a filename on an image). Remove it and resend.

## Troubleshooting

- Inspect details\[].param; GET /v1/parts/{type} documents which fields each shape accepts.

## Related

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