# The adjustment has an invalid combination of types

The adjustment specifies a combination of items whose type is not compatible together.

---

## Example

```json
{
  "error": {
    "type": "request_error",
    "code": "adjustment_invalid_combination_of_types",
    "detail": "The adjustment specifies a combination of items whose type is not compatible together.",
    "documentation_url": "https://developer.paddle.com/errors/adjustments/adjustment_invalid_combination_of_types"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}
```

## Details

| Attribute | Value |
| --- | --- |
| Status code | 400 |
| Error code | `adjustment_invalid_combination_of_types` |
| Error message | The adjustment specifies a combination of items whose type is not compatible together. |

## Common causes

- Items with `type=tax` cannot be combined with any items that have `type!=tax`.

## Common solutions

- Specify items with compatible `type`.