CAM P17730 Currency Purchase Order

Hi

I've got a GBP Business Unit and EURO Supplier. When adding a line type J record and creating a PO for the line from P17730 WO Parts List with the Euro Supplier entered, does the estimated cost/unit cost need to be in GBP so that it converts to EURO on the PO, or is there a way of entering the EURO amount (quote from Supplier) on the WO Parts List and that pass through to the Foreign Amount on the PO?

Regards

Scott