updating material revision levels when user changes contracts(me32k)

Hi,

Can anyone tell me, I have to update material revision levels(ekpo-revlv) during contract change through(me32k) for every item. can anyone tell me which exit i have to use?

i tried using exits

EXIT_SAPMM06E_012

EXIT_SAPMM06E_013

EXIT_SAPMM06E_017

and in these i tried using update ekpo statement but its not updating ekpo table

can anyone help me on this