hogsim

Hi Ewout,
but would it be possible ton include it directly on the invoice?
We are using it for a school, we are selling the book for the school year, and the parents get back money if they bring the book from the last year of their childrens.
So they come to the school to get the order they made and at the same time we check if they give back some book and we include a discount in the order , and we only generate and print the invoice after that. They only pay when the come to the school.
Thanks,
Simon