Try this one tooo.
TYPES:BEGIN OF st_mara.
INCLUDE STRUCTURE mara.
TYPES:END OF st_mara.
DATA:it_mara TYPE TABLE OF st_mara,
wa_mara TYPE st_mara.
*SELECT * FROM mara INTO CORRESPONDING FIELDS OF TABLE it_mara.
wa_mara-matnr = '1'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '2'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '3'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '4'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '5'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '6'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '7'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '8'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '9'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '10'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '11'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
wa_mara-matnr = '12'.
APPEND wa_mara TO it_mara.
CLEAR:wa_mara.
BREAK-POINT.
READ TABLE it_mara INTO wa_mara INDEX 11.
BREAK-POINT.
WRITE:/'MATERIAL CODE', wa_mara-matnr.