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ABAP Keyword Documentation → ABAP − Reference → User Dialogs → Selection Screens →Calling Selection Screens
Selection screens can be called as follows:
Each call starts selection screen processing.
Called by SUBMIT
When an executable program
is called using the statement SUBMIT, the standard selection screen or the
selection screen specified in the statement is called between the events
INITIALIZATION and START-OF-SELECTION, if it contains at least one input field or pushbutton.
Called by report transaction
When a report transaction is executed, the associated executable program is also started internally
using SUBMIT and the selection screen defined for the transaction is called
between the events INITIALIZATION and START-OF-SELECTION.
Called by dialog transaction
If a selection screen of the associated program is defined as the initial screen in a dialog transaction, the transaction code is used to call the selection screen when this program is executed. This screen is not handled like the first screen in a dynpro sequence however (see Selection Screen Processing).
Note
You should not use a selection screen as the initial screen of a dialog transaction, since this does not generally produce the expected program behavior.