when are this three events fired and tell me whuich event
is fired first ,second and third --- at selection -
screen, at selection -screen output, and at selection-
screen on value request.

Answer Posted / salil b

I believe it should be

At selection-screen output.
At selection-screen on value-request.
At selection-screen.

See the triggering sequence of events:
1. INITIALIZATION
2. AT SELECTION-SCREEN ON OUTPUT
3. AT SELECTION-SCREEN ON VALUE REQUEST FOR <FIELD>
4. AT SELECTION-SCREEN ON <FIELD>
5. AT SELECTION-SCREEN
6. START-OF-SELECTION
7. TOP-OF-PAGE(If There is write statement in START-OF-SELECTION)
8. END-OF-PAGE
9. END-OF-SELECTION

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