Hello SuisseAlphine,
Welcome to the Community - thank you for your question!
There is no way to avoid the system creating a VAT exception when posting transactions that incurred in a closed period. This is because they should have been included in that VAT return, and so they need to be accounted for in the current period - this exception will reduce your liability for your current open return as you were due to claim the amount for these additional transactions.
Please let us know if you have any further questions.
Thank you,
Talia
