Reg: moving avg price control V updating

Dear sap Guru's.

My client is already maintaining the FG and SFG goods in Price control V(moving average price). Now i am implementing Product costing for the org. My client requirement is

SFG----V

I

rm1 ----V

rm2-----V

The value of SFG is, the value of rm1 and rm2. How to update the SFG value??

I have seen so many threads. i have not get the exact solution for this.

Please help me.

Regards,

Venkat