What happens AT SELECTION SCREEN events?

Answer Posted / antony

The basic form of the selection screen events is the AT
SELECTION-SCREEN event. This event occurs after the runtime
environment has passed all input data from the selection
screen to the ABAP program. The other selection screen
events allow programmers to modify the selection screen
before it is sent and specifically check user input.
Selection screen events occur both during standard and
user-defined selection screen processing.

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