I’m just trying out Tryton and based in Northern Ireland. Whilst part of the UK we also remain inside the EU customs territory for goods even now after Brexit. We therefore have two VAT numbers. One prefixed GB for sales to customers in Great Britain and an XI number for customers in EU customs area. UK VAT number remains the same, in the same format as before and still prefixed with GB. I notice that when I enter the VAT number in with the prefix it removes the prefix to only leave the VAT number. That concerns me then that if I were to create invoices, way down the line if I ever get there, that it will add an automatic prefix of GB when in fact it could be GB or XI. I know next to nothing about Tryton so just making assumptions here based on that behaviour. Perhaps there is a need for an NI specific Identifier type to cover these XI prefixed EU VAT numbers. The XI VAT numbers can be verified on VIES and that started on 1 January 2021 after the Brexit Transition period finished.