Item Purchase Rate

Item Purchase Rate

Hello, tried to search the forum but found none related.

So my question is how do I input the purchase rate for a new item? The item purchased in the Purchase Order is in USD, but the purchase rate in purchase information (new item) is in IDR (local currency).

Usually we input the purchase rate when we have paid the bills with the exchange rate given on the day we paid it.

So I wonder on how do I create this new item? Should I just put the purchase rate as 1, then manually change it after paying the bill of the purchase order?

Tried to look at the documentation but didn't really find what I'm looking for.

I hope someone can help me on this, thanks!