When entering an invoice the VAT is allocated based on the invoice date. How can i define a VAT period that is different than the invoice date? This is useful, because when a VAT statement has been made (for the Belgian Tax authorities), if after that I enter an invoice with a date that is in the closed period, it impacts the VAT statement. In that case I would like to be able to make sure that the VAT is allocated to the VAT period that is open.