> ## Documentation Index
> Fetch the complete documentation index at: https://docs.costgraph.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Field cannot be changed

> HTTP 422, code immutable_field

<Note>The problem document's `type` field points here: `https://docs.costgraph.ai/pricing/errors/immutable_field`</Note>

```json theme={null}
{
  "type": "https://docs.costgraph.ai/pricing/errors/immutable_field",
  "title": "Field cannot be changed",
  "status": 422,
  "code": "immutable_field"
}
```

## When you see it

The patch targets a field that identifies the price.

## What to do

Delete this price and register a new one; a different identifying field describes a different SKU.

```json theme={null}
{
  "type": "https://docs.costgraph.ai/pricing/errors/immutable_field",
  "title": "Field cannot be changed",
  "status": 422,
  "code": "immutable_field",
  "errors": [{ "pointer": "/region", "detail": "identifies the price" }]
}
```