How to realize goods movement posting at historical Exchange Rate

Hi All,

Our Company code is using parallel currencies 1LC is CNY, 2nd LC is USD. (In T.Code: OB22)

When we look at the values for local currency 2 (USD) in goods movement posting, all the entries have been translated from CNY to USD at the same rate each month, which should be the proper treatment. In fact the translation to USD is occurring at the historical rate for the inventory account,which is correct.

We want post goods movement amounts for LC2 that are posted each month to be translated using the historical rate not the current rate in place at the time goods movement was post. Our issue is how do we make the change to realize the post for inventory at historical Exchange Rate in LC2(usd).

Thanks in Advance