Answer Posted / saifur rahaman

AT SELECTION-SCREEN.

The event AT SELECTION-SCREEN is the basic form of a whole
series of events that occur while the selection screen is
being processed.

The standard selection screen in an executable program or
in the logical database linked to it is automatically
called between the INITIALIZATION and START-OF-SELECTION
events. When you call the selection screen, and when users
interact with it, the ABAP runtime environment generates
selection screen events, which occur between INITIALIZATION
and START-OF-SELECTION.


AT SELECTION-SCREEN OUTPUT

event is triggered. This event block allows you to modify
the selection screen directly before it is displayed.

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