# invalid_ack_transition

> Steering, a preview: an acknowledgement would move a steering instruction to a state it cannot reach from its current one.

HTTP `409` · `retryable` is `false`

Steering a running agent is a preview and not yet part of Kabu. This code comes from its operations: an instruction
moves from received to applied or rejected once, and this acknowledgement asked for another move.

**What to do:** read the instruction's current state and acknowledge from there.

## The response

Every error comes as `application/problem+json`; [Errors](/docs/errors) explains each field.

```json
{
  "type": "https://usekabu.com/docs/errors/invalid_ack_transition",
  "title": "Invalid ack transition",
  "status": 409,
  "code": "invalid_ack_transition",
  "detail": "…",
  "hint": "…",
  "retryable": false,
  "request_id": "req_…",
  "doc_url": "https://usekabu.com/docs/errors/invalid_ack_transition"
}
```