Hello Anandhakrishnan,
I guess there is some problem in your SELECT statement.
Try like below it will work.
TABLES:SA01PHIO.
SELECT-OPTIONS: so_tmst FOR SA01PHIO-CHNG_TIME.
DATA: itab_SA01PHIO TYPETABLEOF SA01PHIO,
wa_SA01PHIO TYPE SA01PHIO.
SELECT *
FROM SA01PHIO
INTOTABLE itab_SA01PHIO
WHERE CHNG_TIME IN so_tmst.
LOOPAT itab_SA01PHIO INTO wa_SA01PHIO.
WRITE:/ wa_SA01PHIO-PHIO_ID, wa_SA01PHIO-CHNG_TIME.
ENDLOOP.