How to use paymetn advice to clear open customer items

Hello,

I manually created a payment advie for a certain amt and i want to use it to clear open item, when i use the payment advice numebr in f-28 incoming payment screen i do not see any data coming up from the payment advice, can anybody tell me how can i use , is there any customizing steps i need to do before the cash application.

kindly let know, points will be awarded.

thanks.