On http://msdn.microsoft.com/en-us/library/dn182593(v=nav.71).aspx link I read about “Payment Registration” window which is used in providing “Payment Discounts” based upon “Payment Terms”, but I could not find this page in NAV 2013 SP1 W1 version and I am not able to process the “Payment Discount”.
But you know, In “Payment Terms Code” we used to have “Discount %” in earlier versions also and system calculates “Possible Payment Disc.” etc., but somewhere I am missing the procedure to apply that calculated discount.