# ambiguous_ref

> A short block ref matched more than one block.

**Ambiguous reference** · HTTP 400

## What it means

A short block ref matched more than one block.

## What to do

Read the itinerary again and pass the full block id.

## Example

```json
{
  "type": "https://api.bymundi.com/problems/ambiguous_ref",
  "title": "Ambiguous reference",
  "status": 400,
  "detail": "A short block ref matched more than one block.",
  "code": "ambiguous_ref",
  "requestId": "req_…"
}
```

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