Discount should not be considered during F110

Dear All,

We have the Scenario as below....

Payment Terms : 10 days , 2 % Discount

Base Line Date : 03/18/2015

Net Due Date : 03/28/2015

Payment Run : 03/31/2015

So as payment run date ( 03/31/2015 ) is already past due date (03/28/2015 ), why system still taking out the discount during payment run ?

Please suggest whether am I missing any other settings ?

Thanks,

Rk