(I'm new to SAP B1, 2007 A)
I defined a payment term under "Administration -> Setup -> Business Partners -> Payment Terms"
Under "Interest on Receivables" I choose 10% (for exemple)
I defined a new partner with this Payment terms, but i don't know how to make the system calculate the late payement fee (even if i create a new order with late date).
If someone can help me it could be wonderfull