Function Request and Problem about multiple currency function

Function Request and Problem about multiple currency function

Hi,

First, you can only add 1 currency, and the other currency is converted automatically based on an pre-setting exchange rate.
But you know the exchange rate varies time to time, so the price is not accurate.

Second, we want to add fields with two currencies.
For example, in the product module, we want to add two prices to a product:
1. Sale price in USD
2. Purchase price in CNY

They are used in Invoice, Sales Order and Purchase Order.
We tried the existing multiple currency function, however it doesn't support this.

We'd like to know how to solve this and can you adding this function?
That will help companys which selling abroad and purchasing domestic.

Thank you.