Payment Terms setup

Hello Friends

I have a requirement to setup payment terms for the below

1. We get 2.5% if we pay by the end of the month following invoice

 

2. We get 2.5% if we pay by end of invoice month plus 45 days, (excluding January invoices, this means payment falls due on the 14^th or 15^th  of the 2^nd month following invoice).

I have setup special calendars but got struck with the discount on the payment term. We are in R12.1.2

Thanks

Dilip