Hi,
S_ is after SBC@ so that interval is not valid. The character _ is after letter B. Sorting in Excel is different than sorting in ABAP AS. The following simple program can be used to test intervals.
REPORT zmv_test.
TABLES: anek.
SELECT-OPTIONS: s_tcode FOR anek-tcode.
START-OF-SELECTION.
IF 'SA38' IN s_tcode.
WRITE: / 'OK'.
ELSE.
WRITE: / 'Fail'.
ENDIF.
Also don't forget that SA38 has additional authorization object S_PROGRAM attached to it.
Cheers