Wauw, Two answers.... ;-)
Your proposed order works! Thanks!
But sometimes I have to pay first, before I get he items.
So sometimes the order should be: purchase order, supplier invoice, supplier payment and then delivery receive.
The delivery receive is derived from the purchasing order. The supplier invoice is entered as new an the payment is derived from this invoice.
If I do it this way, the balans is different than after the proposed order.
EDIT: If I make manualy the invoice with a separate line for the tax, it is ok.
How can I follow my order in a correct way in FA?