PR deletion by LSMW

Hi experts,

I have been working really hard to understand how to delete all open Prs from the system by using LSMW.

I am new with the system, so would highly appreciate if you please share the step-by-step procedures for the deletion of PR against which no PO has been created.

Also, please confirm me which is the best report to check for open PRs? SE16n or ME5A?

Thank you in advance

Regards,

Yousuf