Extractor by function module

Question

Hi,
I've created the function module for extractor.
I'm not able to maintain the size category, please help me in creating data package based on input.
please go through the below code
Example: DataSource for table SFLIGHT
  TABLES: zhses_bst_geography.
Auxiliary Selection criteria structure
  DATA: l_s_select TYPE srsc_s_select.
  DATA: int_persarea TYPE STANDARD TABLE OF ZHR_PERSAREA,
        wa_persarea  TYPE ZHR_PERSAREA.
Maximum number of lines for DB table
  STATICS: s_s_if TYPE srsc_s_if_simple,
counter
          s_counter_datapakid LIKE sy-tabix,
cursor
          s_cursor TYPE cursor.
Select ranges
  RANGES: l_r_carrid  FOR sflight-carrid,
          l_r_connid  FOR sflight-connid.
TYPES: ESP1_BOOLEAN LIKE BAPISTDTYP-BOOLEAN.
CONSTANTS: ESP1_FALSE TYPE ESP1_BOOLEAN VALUE ' ',
           ESP1_TRUE  TYPE ESP1_BOOLEAN VALUE 'X'.
DATA:  l_find_init    TYPE esp1_boolean.
Initialization mode (first call by SAPI) or data transfer mode
(following calls) ?
  IF i_initflag = sbiwa_c_flag_on.
Initialization: check input parameters
                buffer input parameters
                prepare data selection
Check DataSource validity
    CASE i_dsource.
      WHEN 'ZHSES_GEORGAPHY'.
      WHEN OTHERS.
        IF 1 = 2. MESSAGE e009(r3). ENDIF.
this is a typical log call. Please write every error message like this
        log_write 'E'                  "message type
                  'R3'                 "message class
                  '009'                "message number
                  i_dsource   "message variable 1
                  ' '.                 "message variable 2
        RAISE error_passed_to_mess_handler.
    ENDCASE.
    APPEND LINES OF i_t_select TO s_s_if-t_select.
Fill parameter buffer for data extraction calls
    s_s_if-requnr    = i_requnr.
    s_s_if-dsource = i_dsource.
    s_s_if-maxsize   = i_maxsize.
Fill field list table for an optimized select statement
(in case that there is no 1:1 relation between InfoSource fields
and database table fields this may be far from beeing trivial)
    APPEND LINES OF i_t_fields TO s_s_if-t_fields.
  ELSE.                 "Initialization mode or data extraction ?
Data transfer: First Call      OPEN CURSOR + FETCH
               Following Calls FETCH only
First data package -> OPEN CURSOR
    IF s_counter_datapakid = 0.
    CALL FUNCTION 'Z_HR_RFC_HSES_BST_FACILITY'
      EXPORTING
        interface_key        = '0000000291'
  PERNR                =
  USRID                =
  STREET               =
  STATE                =
  COUNTRY              =
       date                 = sy-datum
  PERSONNEL_AREA       =
IMPORTING
  RETURN_MESSAGE       =
      CHANGING
        exp_pers_area        = int_persarea
CLEAR wa_persarea.
loop at int_persarea INTO wa_persarea.
  CLEAR e_t_data.
  e_t_data-HEMISPHERE = wa_persarea-HEMISPHERE.
  e_t_data-COUNTRY_OUT = wa_persarea-COUNTRY_OUT.
  e_t_data-REGION_OUT  = wa_persarea-REGION_OUT.
  e_t_data-CITY       = wa_persarea-CITY.
  e_t_data-STREET     = wa_persarea-STREET.
  APPEND e_t_data.
ENDLOOP.
   g_counter_datapakid = g_counter_datapakid + 1.
endif.
endif.

Answer 1

you are missing some part of these code in your logic...
From now on records get fetched from the database or gets read from the internal table
    FETCH NEXT CURSOR v_cursor
               APPENDING CORRESPONDING FIELDS
               OF TABLE <internal table>
               PACKAGE SIZE i_s_if-maxsize.
    IF sy-subrc <> 0.
      CLOSE CURSOR v_cursor.
      RAISE no_more_data.
    ENDIF.
try to use your logic as mentioned in the link which i have specified.try to insert your code at the right place.
rgds, Ghuru