Pay date different from transaction date

For certain type of invoices from AR we want to pay after one month of the transaction date.  For normal transactions we pay next pay period.

Eg: Normal Transaction:  Transaction date: 19-Dec-2015  Pay date: 10-Jan-2016.  So the system will consider the pay rate schedule of 19-Dec-2015 in order to determine the commission rate.

       Exceptional Transactions:  Transaction date: 19-Dec-2015.  Pay date: 10-Feb-2016.  In this case the transaction date 19-Dec-2015 should be used for deriving the rate and quota limits and accelerator.  But it should be paid one month after.

How can do this in OIC.  We are in 12.1.3.