428: Invoice signature incorrect
What it means
FACe error 428 means the invoice's signature is incorrect.
The usual cause
The electronic signature does not verify, for example because the file was changed after signing or the signature is not in the Facturae format.
How to fix it
Sign the final invoice file again with a valid certificate, without changing it afterwards, and send it.
The code as published
La firma de la factura es incorrecta Read the official document . Source: FACe, Códigos de Error, version 3.3 (octubre de 2017), published by Secretaría General de Administración Digital, Equipo FACe, read on 8 November 2026.
Other FACe codes
- 408 Invoice format incorrect
- 409 Managing body code not found or inactive
- 410 Processing unit code not found or inactive
- 411 Accounting office code not found or inactive
- 412 Unit codes do not belong together
- 413 Unit relation not active
- 414 Invoice number already exists
- 415 Invoice already exists
- 416 Wrong number of administrative centres
- 417 Administrative centre code missing
- 418 Payer, receiver or fiscal centre wrong
- 419 Only individual invoices accepted
- 420 Batches not accepted
- 421 Party type incorrect
- 422 Issuer type wrong for a third-party invoice
- 423 Individual's name missing
- 424 Company name missing
- 426 IBAN required for this payment method
- 427 Person type missing
- 430 Invoice version not recognised
- 431 Date format error
- 432 Certificate class not accepted for signing
- 433 Too many attachments
- 434 Signing certificate incomplete
- 437 Extensions not accepted
- 438 Certificate class not accepted for delivery
- 439 Certificate not accepted for signing
- 440 Signature policy incorrect
- 441 Test units not allowed here
- 442 Certificate blocked or a test certificate
- 443 Corrective invoice format incorrect
- 444 Issuer and assignee identifiers match
- 445 Invoice number required
- 446 Line description required
- 447 Issuer's DNI incorrect