The easiest way to display an ALV in PopUp is to use the standard function module REUSE_ALV_POPUP_TO_SELECT. The ALV can be editable also, so the ALV will help for example to select lines without a set of lines.
ABAP PopUps are rich enough to do different functions.
In this articles, I will try to details the most used Abap Popup window kind with sample SAP ABAP code of course to help you implement it quickly.
This is a step by step tutorial how to create and display Popup Window in WebDynpro Abap. Build Popup Window in Webdynpro abap
Debug Popup Screen in ABAP can be helpfull to follow/understand the processing of ABAP flow.
The ‘/h’ doesn’t work in this case. I added the most common Debugging command for ABAP reports.