Answer Posted / bharath

The Events in ABAP are,
Classical Events.
1) Initialization
2) Load of Program
3) At selection-screen output
4) At Selection-Screen of Field
5) At Selection-Screen on Value-Request
6) At Selection-Screen on Help-Request
7) At Selection-Screen
8) Start of Selection
9) End of Selection
10) Top of Page
11) End of Page

Interactive Events
12) At Line-Selection.
13) At PF key
14) At User-Command
15) Top-of-page During Line-Selection.

Module pool Programming events are
1) PAI - Process After Input
2) PBO - Process Before Output
3) POV - Process On Value Request (F1 HELP)
4) POH - Process On Help Request (F4 HELP)

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