Open banafsheh-unify opened 2 years ago
At least one issue occurs when checksum mod 11 is 10, according to the spec this should indicate an invalid VAT number. An english version of the specs can be found here https://ec.europa.eu/taxation_customs/tin/#/check-tin (download file under "Get the TIN specifications", page 42).
This is the case with VAT number 1234567890.
It seems there is an issue with VAT validation for Poland. According to this wikipedia page (https://pl.wikipedia.org/wiki/Numer_identyfikacji_podatkowej) and the spec here (https://romek.info/ut/nip-rego.html#nip) the following numbers are invalid VAT numbers: