Sales Order Currency Problem


I am having trouble creating usefull purchase orders. Our store currency is in UK GBP. Our suppliers currency is in USD.

All of our products have a fixed supplier pricing in USD. The final landed price we pay is flexible based on exchange rate. We cannot add the buying prices in GBP and convert them to USD as this will be inaccurate as rates change.

1-Can we enter product buying prices in the non-store currency? The currency feature on the purchase order works in the wrong direction, so that the local buying price changes. This is a key problem that I hope can be solved.

Any help really appreciated. So many other parts of the platform are fantastic. - like bundles!