拼接报错信息

     e_msg-type = 'E'.
        MESSAGE id SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4 INTO e_msg-msg.
        APPEND e_msg.
        CLEAR  e_msg.