At s-s

what is the difference between At selection-screen and At selection-screen output ?which wil trgger first?what is their purpose?

Hi,
The event AT SELECTION-SCREEN OUTPUT is executed at PBO of the selection screen every time the user presses ENTER - in contrast to INITIALIZATION. Therefore, this event is not suitable for setting selection screen default values.
But you can use LOOP AT SCREEN or MODIFY SCREEN to change the input/output attributes of selection screen fields.
The event AT SELECTION-SCREEN is processed when the selection screen has been processed (at the end of PAI). We usually write input validations in this event.
AT SELECTION-SCREEN OUTPUT is executed first.

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