VF-1255
Si FechaOperacion (FechaExpedicionFactura si no se informa FechaOperacion) es mayor o igual que 01/02/2021 no se permite el valor 'GB' para Identificaciones NIF-IVA
In English For operations from 1 February 2021, an EU VAT number may not start with GB; Northern Ireland uses XI.
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
[1255] Si FechaOperacion (FechaExpedicionFactura si no se informa FechaOperacion) es mayor o igual que 01/02/2021 no se permite el valor 'GB' para Identificaciones NIF-IVA
$otype != '02' or not(starts-with($oid, 'GB')) or empty($odate) or $odate lt xs:date('2021-02-01')
Checked with VERI*FACTU invoice records