Answer / sagi.nagamani

AT SELECTION SCREEN : TO VALIDATE ALL FIELDS.whenever user
presses enter this event is triggered.if there is any
error,system redisplays the screen by enabling all fields.

AT SELECTION SCREEN ON : to validate a specified field.
whenever user presses enter this event is triggerd.if there
is any error,system redisplays the screen by enabling only
that particular field & disables all the fields.

AT SELECTION SCREEN OUTPUT : THIS EVENT IS TRIGGERED BEFORE
SELECTION SCREEN APPEARS.here u can perform user defined
actions like making fields mandatory,hide like that.

Answer / nagaraju

At selection screen event is used to validate the multiple
fields.

At selection screen on field is used to validate the
perticular field(which we want to validete)

At selection screen output it is used to disable the value
on a selection screen of any fields.

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