multi currency purchases costs

Hi,

I'm failed to add additional cost with different currency to a purchase order for a supplier (purchase order currency GBP).

this option is very important due to the cost not always be in the same currency, some times  i need to add e.g: shipping cost in USD, customs cost in JOD.. etc.

also it is important to add payments in multi currencies.

please work on this to add this features ASAP, as it's very important to our accounting system.

regards

Manar