Intervat

I would definitely contact the relevant authority about this, because it doesn't seem normal to me.

Gitta

I have since been in contact with an employee of the FPS Finance, who gave me an explanation of how you can find old declarations via Consultations. The reference number you need to fill in there is stated in the XML receipt confirmation that has been uploaded to Dexxter. She did advise me to always download the PDF version of the receipt confirmation as well, because it states all the information and is therefore more useful if an old return cannot be found.