List Box in ABAP Report

*
REPORT ZLIST.

TYPE-POOLS: VRM.

DATA: NAME  TYPE VRM_ID,
     LIST  TYPE VRM_VALUES,
     VALUE LIKE LINE OF LIST.

PARAMETERS: PS_PARM(10) AS LISTBOX VISIBLE LENGTH 10.

AT SELECTION-SCREEN OUTPUT.

NAME = 'PS_PARM'.
VALUE-KEY = '1'.

VALUE-TEXT = 'LINE 1'.
APPEND VALUE TO LIST. VALUE-KEY = '2'.

VALUE-TEXT = 'LINE 2'.
APPEND VALUE TO LIST.

CALL FUNCTION 'VRM_SET_VALUES' EXPORTING ID = NAME VALUES = LIST.

START-OF-SELECTION.
WRITE: / 'PARAMETER:', PS_PARM.