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

{
  "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

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.

Troubleshooting

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