I wanted to invoice a customer for a project. Generated an invoice and proceeded to view it before sending it (luckily...). What happens is that the Total amount to be payed (the last number on the invoice) is the total of all of the customers open invoices... So an invoice that should be NOK 744,00 was in this case NOK 26 000,00. If the point of this is to show the customer how much he owes me, it is not a good way...