Anyone knows how to implement in Baan, the fact that, when a invoice is not pay at time, calcules in automatic a interest over the amount not payed?
Thank you in advance.

There are two ways to implement the interest invoices.
First you can implement the reminder interest in tfacr3120m000.
Second you can implement the real interest invoices in tfacr5101m000. This business object is calculating the overdue days and multiplies the days by a previous defined percentage and makes a brand new invoice for the amount of the interest.