# change_not_applied

> Only an applied change can be reverted; this one is already reverted, failed, or was superseded.

**Change cannot be reverted** · HTTP 409

## What it means

Only an applied change can be reverted; this one is already reverted, failed, or was superseded.

## What to do

List changes with GET /changes to see its status.

## Example

```json
{
  "type": "https://api.bymundi.com/problems/change_not_applied",
  "title": "Change cannot be reverted",
  "status": 409,
  "detail": "Only an applied change can be reverted; this one is already reverted, failed, or was superseded.",
  "code": "change_not_applied",
  "requestId": "req_…"
}
```

How to read any error: [Errors guide](https://api.bymundi.com/docs/guides/errors.md).