How to import multi currency transactions into Xero

When importing transactions that contain multiple currencies, Xero will determine the currency to use based on the currency set on the Contact (Customer or Vendor) record, it is not necessary to specify the currency, however it is possible to specify an Exchange Rate that should be used for that particular transaction.  The exchange rate is the market price for which this currency can be exchanged for the currency used by the QuickBooks company file as the "home" currency.