A posting's cost must be of a different commodity than its amount

[Chris Gray]

Hi,

I am trying to record a transaction and I am getting the error that I
mentioned in the subject line.  I think the problem is that I do not use
a currency symbol in general when adding transactions.  This is because
my keyboard does not have a Euro symbol, so it is very cumbersome to add
one to each transaction.  The transaction is as follows:

2009/06/03 Westjet
    Expenses:Transportation:Air             C$429.80 @ 1.572865
    Expenses:Bank:Fees                          2.73
    Liabilities:Mastercard                          

Where 1.572865 is the exchange rate between Canadian dollars and Euros
that was used.

Is there a better way to do this or a workaround?

Cheers,
Chris