Question - How can validate input values in selection screen and which event was fired?
Answer -
We can Validate Selection Screen With the Help of the Following Events, the Event Follows the Same hierachy.
AT SELECTION-SCREEN ON
AT SELECTION-SCREEN ON BLOCK
AT SELECTION-SCREEN OUTPUT
AT SELECTION-SCREEN.
At selection-screen on
select stmt ------------------ where = .
if sy-subrc = 0.
validation success for LOw value in selection screen
At selection-screen on
select stmt-------------------- where =
if sy-subrc <> 0.
validation failure on high value in the selection field.
else
success.
endif