Currency on a Direct Ship Order

Hello,

There are Direct Ship Orders (SD/OD) for which the Sales Order is showing the currency correctly (USD), however for the Purchase Order the currency is showing the currency as CAD and hence the exchange rate is displayed since the base currency of the company is USD.

The supplier Master has been setup having default currency for the supplier as "CAD"

The General accounting department does not want to change the Default Currency.

They want the system to choose, for certain Direct Ship orders (SD/OD) orders, to choose the default currency from the "Ship To" not from the Supplier.