In Ledger, currencies can co-exist in the same account, so all you need is this:
D 1,000.00 AUD
D 1,000.00 EUR
2009/01/01 First sale
Assets:Bank 10000.00 AUD
Income:Sales
2009/02/01 Marketing (1 EUR = 2.00 AUD)
Expenses:Marketing 2000.00 AUD
Liabilities:Accounts Payable:EUR -1000.00 EUR
2009/03/01 Pay Marketing Invoice (1 EUR = 1.95 AUD)
Liabilities:Accounts Payable:EUR 1000.00 EUR
Assets:Bank -1950.00 AUD
Ledger will compute the exchange rates for you, and both balances and -X AUD
should produce what you expect.
John
