Routine based on Function Module

Hello All,
i have to write code for a routine using a custom function module that is created previously.
the function has input parameter IN_YEAR_WEEK and output parameter EN_WEEK_1 , EN_WEEK_2.
this routine is in the transformation between cube and open hub between the 0calweek of the cube and a custom field znum_week in the open hub.
the input parameter of the function like 201005 (the fifth week in 2010 year) is the same value that i will have in the 0calweek of my cube and give in output 2 parameters between 0 and 5 that's mean the number of week in the month.
the value between 0 and 5 should be puted in the znum_week field
if the function return value between 1 and 5 i should have duplicate records in the open hub file.
can you give me please some advice how should be my abap coding for this routine.
should i use start routine? or routine of the single field?
thanks
Bilal

Hi ALL,
i have created this code for start routine to duplicate records in my open hub, can you tell me please if the logic is correct?
data: v_week_1 like n.
data : v_week_2 like n.
DATA: vn_tabix LIKE sy-tabix.
data: wa_temp LIKE SOURCE_PACKAGE.
LOOP AT SOURCE_PACKAGE ASSIGNING <SOURCE_FIELDS>.
CALL FUNCTION ' ZIV_DP_FUNC_NUM_WEEK_LA '
    EXPORTING
        IN_YEAR_WEEK = <SOURCE_FIELDS>-/bic/0calweek
    IMPORTING
      EN_WEEK_1 = v_week_1
       EN_WEEK_2 = v_week_2.
If v_week_1 between 1 and 5 and v_week_2 = 0
<SOURCE_FIELDS>-/bic/0calweek = v_week_1.
MODIFY SOURCE_PACKAGE INDEX vn_tabix FROM < SOURCE_FIELDS>.
Endif.
Else
If v_week_1 between 1 and 5 and v_week_2 between 1 and 5
<SOURCE_FIELDS>-/bic/0calweek = v_week_1.
MODIFY SOURCE_PACKAGE INDEX vn_tabix FROM < SOURCE_FIELDS>.
MOVE <SOURCE_FIELDS> to wa_temp.
wa_temp-/bic/0calweek = v_week_2.
APPEND wa_temp TO SOURCE_PACKAGE.
Endif.
REFRESH: wa_temp.
thanks a lot
Bilal

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FUNCTION ZSALESTEXT_EXTRACT.
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""Lokale Schnittstelle:
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The code is displayed here:
error is in line no. 625
Source Code Extract
Line SourceCde
595            <fs_fldval> = l_fieldval.
596            APPEND <fs_dyntable> TO <it_dyntable>.
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620        ELSE.
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check this blog
/people/siegfried.szameitat/blog/2005/09/29/generic-extraction-via-function-module
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Generik extraction: https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a0f46157-e1c4-2910-27aa-e3f4a9c8df33
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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 !__+
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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
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Hi,
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3. Based on Function module
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Check this blog for more info on fn module extractor:
/people/siegfried.szameitat/blog/2005/09/29/generic-extraction-via-function-module
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