User selected records

Hi,

I tried to select the user selected records from a table by useing check box, I am always getting the 2nd next record from the selected record. Suppose if user selcts record no 1 then I am getting record no 3 in to my itab. Can some one please guide me where I am doing wrong.

AT USER-COMMAND.

CASE sy-ucomm.

WHEN 'CMEMO'.

DATA: lv_cnt TYPE i.

DESCRIBE TABLE gt_zprice LINES lv_cnt.

• lv_cnt = lv_cnt + 2.

DO lv_cnt TIMES.

READ LINE sy-index FIELD VALUE chbox.

IF sy-index > 0 AND chbox = 'X'.

READ TABLE gt_zprice INTO gs_zprice INDEX sy-index.

IF sy-subrc EQ 0.

APPEND gs_zprice TO gt2_zprice.

CLEAR gs_zprice.

ENDIF.

ENDIF.

ENDDO.

Thanks,

Neelu.