Creation of transfer order between 2 companies with different currencies

We are trying to create a transfer order between 2 companies with different currencies.

Using the JDE screen, we are able to change the “Currency Code - To” on the header which will populate the PO currency.

The default code on supplier master of the ship from branch plant is left blank because we may need to ship from this supplier to a different company with different a currency code and we want to update the currency code when creating the transfer order.

Using web services, we are passing a value to the “currency code to” field and we had an error with the currency exchange. If we update the currency code on the supplier master of the ship from, the error will be eliminated. Looks like even if we passed the “currency code to” in the web service the application is only looking to the supplier ship from currency.