Transformation Routine for checking condition only once

Hello,
I would like to perform he calculations based on certain criteria which goes like this...
      LOOP AT ITab WHERE EMPno = ITAB Empno AND
                        ATYPE = ITAB-stype .
        IF ITAB-LTYP = '1000'.
          CHECK ITab-ABEGIN GE YR_BEGDT AND ITab-ABEGIN LE YR_ENDDT.
          CHECK FLAG_ST <> 1.
          ITAB-PENDING_ST = ITAB-PENDING_ST + ( ( ITab-BAL / 825 ) * 100 ).
        ELSEIF ITAB-STPE = '2000'.
          CHECK FLAG_SL <> 1.
          ITAB-PENDING_SL = ITAB-PENDING_ST + ( ( ITab-BAL / 825 ) * 100 ).
          ENDLOOP.
      IF ITAB-stype = '1000'.
        FLAG_ST = 1.
      ENDIF.
      IF ITAB-stype = '2000'.
        FLAG_SL = 1.
      ENDIF.
      MODIFY ITAB.
How to implement this logic in Transformation roles ... as this flag checks only once.... to perform the calculation.
Thanks
    ENDLOOP.

Hi there,
You must be aware of start and end routine in a transformation.
Assumin that you would like to modify the code before sending it to individual( field wise transormation) transformation , you can write your code in start routine tab of the transformations.
Code written in Start routine in a transformation can manipulate the data data package wise..
say for eg if u need to fill the values in indivual routine then u can save all the values in an internal table ( say for eg ur itab) in the start routine and this data is available for u in the transformation routines.. so anything written in start rotuine shall work as global modification for the transformation routines.
Similarly code written in end rotuine shall work for chunk of data which is modified individually in transformation routine.
you ca go thr this link for more clarification
http://www.sdn.sap.com/irj/scn/index;jsessionid=(J2EE3417700)ID2067718350DB10090875593766856688End?rid=/library/uuid/609eea32-455e-2c10-c08a-c23adf8c934e&overridelayout=true
http://help.sap.com/saphelp_nw04/helpdata/en/4f/a9ea964a86b04dbe4df20af6e598cf/frameset.htm
Regards,
kk

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