# Cannot make a subscription update resulting in a mismatch between customer entities

You are attempting to make an update to a subscription that will result in a mismatch between customer entities.

---

## Example

```json
{
  "error": {
    "type": "request_error",
    "code": "subscription_update_causing_customer_mismatch_not_allowed",
    "detail": "Paddle cannot complete this action as it will result in a mismatch between customer entities.",
    "documentation_url": "https://developer.paddle.com/errors/subscriptions/subscription_update_causing_customer_mismatch_not_allowed"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}
```

## Details

| Attribute | Value |
| --- | --- |
| Status code | 400 |
| Error code | `subscription_update_causing_customer_mismatch_not_allowed` |
| Error message | Paddle cannot complete this action as it will result in a mismatch between customer entities. |

## Common causes

- You're trying to make an update to a subscription that generates credits, but a new customer entity has been linked to the subscription since the last renewal. This would mean creating a credit against a transaction for a customer with credit from a another customer, which isn't permitted.
- You're attempting to link a new customer to the subscription which is not permitted if there are pending credits belonging to the previous customer.

## Common solutions

- Consider using a proration billing mode that won't create credits.
- Try this change again after the next renewal.