UNSUPPORTED_TX_FIELD

The transaction carries a fee-relevant field this Relay-Unit schedule does not price.

HTTP status	422
Group	Pricing and purchase
Retryable	No — sending it again changes nothing

What happened

If a protocol upgrade adds a field that changes what a transaction costs, CoRelayer refuses it until a schedule version that prices it is active — rather than guess and under-charge.

What to do

Remove the field, or wait for the schedule version announced in the changelog.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/unsupported-tx-field",
  "title": "The transaction carries a fee-relevant field this Relay-Unit schedule does not price.",
  "status": 422,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "UNSUPPORTED_TX_FIELD",
  "retryable": false,
  "hint": "Remove the field, or wait for the schedule version announced in the changelog."
}

See the error model for what each member means and how to handle unknown codes.