To allow the user to process only the first row of the selection table on the selection screen, you use the following syntax:
SELECT-OPTIONS seltab FOR f..... NO-EXTENSION.....
As a result, the pushbutton for multiple selections does not appear on the selection screen, and multiple selections are not available to the user.
DATA wa_spfli TYPE spfli.
SELECT-OPTIONS airline FOR wa_spfli-carrid NO-EXTENSION.
The following standard selection screen appears: