Restricting Entry to Single Fields 

To allow the user to process only single fields on the selection screen, you use the following syntax:

SELECT-OPTIONS <seltab> FOR <f> ..... NO INTERVALS .....

As a result, the second input field does not appear on the selection screen. The user can only enter a single field comparison for the first row of the selection table. However, the user can call the Multiple Selection screen and enter range selections there.

DATA WA_SPFLI TYPE SPFLI.

SELECT-OPTIONS AIRLINE FOR WA_SPFLI-CARRID NO INTERVALS.

The following standard selection screen appears:

The user can enter only a single field directly. However, the user can enter multiple selections by clicking the pushbutton on the right side of the screen.

If you use the NO-EXTENSION addition as follows:

DATA WA_SPFLI TYPE SPFLI.

SELECT-OPTIONS AIRLINE FOR WA_SPFLI-CARRID NO INTERVALS
                                           NO-EXTENSION.

the selection screen looks like this:

Now, the user can actually enter only a single field comparison.