Recovering vAT from 2019 in this year

I think you have to arrange that with the percentage? Off the top of my head, step 4? Is that possible?

There you can adjust your vAT deduction percentage. Or you could just take the invoice yourself, make a note somewhere -> enter 2/5. And then just stop the invoice in Dexxter, as if the invoice only covers 2/5 of the price. As long as it's clear afterwards that you still know what you've done :) Both for yourself and for any checks.

Thank you for your answer. That does indeed sound logical. And easy to do ;-)