Foreign currecny valuation

Hello experts,

I have a small doubt reg FCV.......

i have posted an inv for rs.50,000/- on 10.05.2008 and I am paying this inv on 20.05.2008 for the same amount

Parameters maitained: GL open item mgmt, forex table etc., and also defined valuation method, account determination etc.,

Now i want to valuation for this scenario...how? and in F.05 what should we need to maintain? what are the entries system will generate?

could anybody share your thoughts please. Will assign good points

thanks

anita