Prox Terms

I am having problems getting Prox terms entered into Mapics to provide 
accurate due dates.  I am trying to enter "2% 10th Prox" which means that 
the invoice will be due on the 10th of the next month until the cut off of 
the month, which is the 25th.

This means if I invoice on 11/11/2003 the payment is due 12/10/2003.
If I invoice 11/26/2003 (after the 25th cut-off) the payment would be due 
1/10/2004
and invoices up to 12/25/2003 should be due 1/10/2004

I have spoken with Mapics and went round-and-round on this so I am 
throwing this issue out to the list for help.

At this point I have the terms set to:

Day Due:  10
Month End Cutoff: 25
Net Due: 25

I have "messed with" the net due to make the calculation work but cannot 
get this thing to calculate properly.

Your help is appreciated,
Marc Rohde
IT Manager
Pentair Water Treatment\Plymouth Products, Inc.
Work: 920-451-9421
Cell: 920-698-2008
Fax: 920-803-3540