Dutch company with Belgian VAT number, how to create this company?

I'm not sure, but it seems to me that if this company has charged you vAT, I would consider it a Belgian company. Since that company will also have to file a vAT declaration with the vAT administration. If the vAT has been reversed, you might as well use the Dutch vAT number, since you will then settle the vAT yourself.

That's correct.If that company has invoiced your Belgian vAT number (i.e. your number is on their invoice) and they charge 0% vAT (reverse-charged vAT), then they do so from their Dutch vAT number and you register them as a Dutch supplier.If that company has invoiced your Belgian vAT number (i.e. your number is stated on their invoice) and they charge 21% vAT, they do so using their Belgian vAT number and you register them as a Belgian supplier.

Regards, Jean (former accountant, Dexxter enthusiast)

Exactly what I searched for... thank you everyone.