Credit note gives error message

But you said it yourself, didn't you? It states that you have to enter a credit note as a positive amount.

Then you just fill in 100 euros excluding VAT and 112 euros including VAT. So just fill it in as a positive amount, right? Or do you mean something other? :)

No, it would be the amounts -259.09 euros excluding VAT and -258.31 euros including VAT. The excluding amount as a positive number is therefore greater than the including positive number. When I try to enter that, I get an error message :/

Is there a negative part to 6% vAT and a positive part to 21% vAT?

If so, split that one document into two documents. Fictitious, of course, just enter it twice. Once as a credit note and once as a regular invoice.

Entering it twice according to the vAT % is the solution.

Thank you very much!