how to update the equipment number in Va02 Through Dp90

Hi All,

  how to update the Equipment field in Va02 (Extras-----> technical objects) through Dp90 transaction..my enhancement should triggere when ever billing request is generated in dp90.DP90 transaction will contains the contract number and equipment number.we have to get this equiment number and update in Va02..

If any body worked on Technical objects please let me know how to do this enhancement...(updating field value on Va02)

Thanks,

rasool.