Hi Pankaj,
In F150 transaction click on Individual dunning Notice and enter the details like Company code, Customer , Run on Date, Dunning date, Documents posted up to and click on Printout.
Note : Pleae enter date as per dunning interval. In your case please put date after 15 days of first dunning run.
Please test this and let me know.
Reward points if it helps to resolve your query.
Thanks and Regards,
Prakash Kumar