Using the SAP logging features

Very quick instructions:

1) create a log object and subobject in SLG0
2) initialize the log object/subobject (g_loghandle is a global variable)

  DATA: l_loghead TYPE bal_s_log.

  IF w_loghandle IS INITIAL.
    l_loghead-object     = 'ZMYOBJ'.
    l_loghead-subobject  = 'MYSUBOBJ'.
    l_loghead-aldate_del = sy-datum + 90. "expires in 90 days

    CALL FUNCTION 'BAL_LOG_CREATE'
      EXPORTING
        i_s_log      = l_loghead
      IMPORTING
        e_log_handle = g_loghandle
      EXCEPTIONS
        OTHERS       = 1.
  ENDIF.

3) add the messages to the log

DATA: ls_logmsg    TYPE bal_s_msg.

ls_logmsg-msgty = msg_type.
ls_logmsg-msgid = msg_id.
ls_logmsg-msgno = msg_number.
ls_logmsg-msgv1 = msg_v1.
ls_logmsg-msgv2 = msg_v2.
ls_logmsg-msgv3 = msg_v3.
ls_logmsg-msgv4 = msg_v4.


CALL FUNCTION 'BAL_LOG_MSG_ADD'
    EXPORTING
      i_log_handle = g_loghandle
      i_s_msg      = ls_logmsg
    EXCEPTIONS
      OTHERS       = 1.

4) save the log

  DATA: lt_log_handle TYPE bal_t_logh,
        ls_log_handle LIKE LINE OF lt_log_handle.

  ls_log_handle = w_loghandle.
  APPEND ls_log_handle TO lt_log_handle.

  CALL FUNCTION 'BAL_DB_SAVE'
    EXPORTING
      i_t_log_handle = lt_log_handle
    EXCEPTIONS
      OTHERS         = 1.

  COMMIT WORK.

5) see the results with SLG1