Answer / lakshmi

Start-of-Selection-This event gets triggered when the user
clicks on execute button on Selection screen. All the Data
retrieval and data processing logic will be written in this
event.

End-of-page- This event is used to print page footers for a
report

End-of-selection- Any processing required before exiting the
report is done in End-of-Selection.

Answer / sampath

in general in sap data is divided into blocks to activate blocks we need to use start_of_selection,generally this is used for subroutines

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