Changing the object list in a service order before order save

Hi Experts,

I have a requirement where I need to modify the records in object tab on service order tcode “IW31”, IW32.

My req is if i enter a Main Equipment in a service order, if it has the sub Equipment, I want to show all the materials maintained in the main and sub equipments. I need to show them in the Object list tab of IW31 and IW32 txncodes.

Its in ECC 6.0.

Can some one please tell me the User exit or the Badi to do it.Also can any one tell me the FM or the BAPI's used for this,, Please reply me soon.

I am in very much need of this...

Regards,

Kiran

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