How to - customize datasource by means of 'Function module' via 'RSO2' ?

Wilson, the topic of Function Module extractors is well documented in the forums - please search the forums before posting
+__Hi,Expert:__+
+__Could you please kindly advise me how to customize datasource by 'Function module',__+
+__and which aspects I should pay more attention?__+
+__Or provide me valuable documentation.__+
+__Thanks very much !__+
Edited by: Arun Varadarajan on Feb 11, 2009 9:58 AM

Hi Wilson,
Check here..........
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a0f46157-e1c4-2910-27aa-e3f4a9c8df33
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/84bf4d68-0601-0010-13b5-b062adbb3e33
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/d3219af2-0c01-0010-71ac-dbb4356cf4bf
Generic extractor based on function module RSAX_BIW_GET_DATA_SIMPLE
Thanks,
Vijay.

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DATA: BEGIN OF ITAB5_WRK OCCURS 0,
        KUNNR     TYPE KNKK-KUNNR, "CUSTOMER #
        SBGRP     TYPE KNKK-SBGRP, "CREDIT REP
        KLIMK     TYPE KNKK-KLIMK, "CREDIT LIMIT
        NAME1     TYPE KNA1-NAME1, "CUSTOMER NAME
        SKFOR     TYPE KNKK-SKFOR, "TOTAL A/R
        AMT1      TYPE KNKK-SKFOR, "CURRENT
        AMT2      TYPE KNKK-SKFOR,                          "01-30
        AMT3      TYPE KNKK-SKFOR,                          "31-60
        AMT4      TYPE KNKK-SKFOR,                          "61-90
        AMT5      TYPE KNKK-SKFOR,                          "91-120
        AMT6      TYPE KNKK-SKFOR,                          "OVR 120
        BZIRK     TYPE KNVV-BZIRK,
      END OF ITAB5_WRK.
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SELECT KUNNR SBGRP FROM KNKK
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ENDLOOP.
PERFORM GET_CREDIT_LIMITS.
*=======================================================================
IF P_DIST NE SPACE.
    LOOP AT ITAB5_WRK.
      SELECT SINGLE * FROM KNVV WHERE KUNNR EQ ITAB5_WRK-KUNNR
                                  AND VKORG EQ P_COMP
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                                  AND BZIRK IN P_DIST.
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*==============================================================
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EXPORTING
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      SFAE2             = W_SFAE2
      SFAE3             = W_SFAE3
      SFAE4             = W_SFAE4
      SFAE5             = W_SFAE5
      SFAE6             = W_SFAE6
      SFAEL             = W_SFAEL
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      SNFA2             = W_SNFA2
      SNFA3             = W_SNFA3
      SNFA4             = W_SNFA4
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      SNFAE             = W_SNFAE
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if p0000-stat2 = '3'.
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How to - customize datasource by means of 'Function module' via 'RSO2' ?

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