Cash discount on charges/modifier discounts

Hi,

I have a scenario where we are using modifiers in OM at Line level to create charges and discounts. We are passing the discount information to AR as well. Now  lets say I have 1 line with a total of $100 and a modifier which allow a 10% discount on line so the discount amount is $10.

2 lines are getting interfaced to AR which are

1. Standard line with list value $100

2. Discount line with value as -$10

Invoice amount is $90. Both the line types are of type 'LINE'

The payment term is allowing a 2% discount if paid before 60 days. Is there way the payment term can only allow for discount on the standard line which means a discount of 2% on $100 = $2.