DATA: lv_chr(4) type c,
lv_num    type p.

CALL FUNCTION 'MOVE_CHAR_TO_NUM'
EXPORTING
CHR             = lv_chr
IMPORTING
NUM             = lv_num
EXCEPTIONS
CONVT_NO_NUMBER = 1
CONVT_OVERFLOW  = 2
OTHERS          = 3.
IF SY-SUBRC <> 0.
  * MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
  *         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.