Hi,
You can use make use of field symbols for this.
E.g.
* Make sure there are no duplicate materials in the ITAB, else make a read table statement before select query.
LOOP AT itab ASSIGNING <fs_wa>.
SELECT SINGLE maktx
FROM makt
INTO <fs_wa>-maktx " Your field for material description
WHERE matnr = <fs_wa>-matnr.
ENDLOOP.
Regards,
Gaurav