I think Ive found what the problem is:

- If a transaction has a VAT code, it will NOT show the CLASS (column empty) even if the VAT code is "no vat" or "exempt" or "0%"

- If a transaction is declared as "Out of Scope VAT" (see example here: https://prnt.sc/yvrj0j ) , it WILL show the CLASS correctly (column not empty)

This is OK for us, because 99% of our transactions are VAT free, so I can use the Out of Scope option and get the CLASS column correctly populated. But this lead us to 2 new problems:

1- I cannot reclassify the VAT to "Out of scope" because that option  is not available even in the Accountant Tools menu, it only allows to reclassify to an existing VAT code (but remember that "0%" or "exempt" or "no vat" does not do the trick, it must be out of scope as seen here https://prnt.sc/yvrj0j )

2- We have a few transactions with actual VAT 20%, and we need to have the CLASS for those transactions too.

Now its with you guys, what can I do to solve this problem?