Answer / sunil

at selection screen is used for validating fields,
At selection screen out put is used for setting field
property like enable , disable, input etc

Answer / surya

AT SELECTION-SCREEN: used for validating the fields for
fields on the selection screen.after user click on the
execute button then this event will be triggered.

AT SELECTION-SCREEN OUTPUT: It is used for modifying the
selection screen based on the user selection.this event
will be triggered befor execute the program.

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