On the
oneworld Explorer web page there is a link to the fare rules:
Code:
15. SALES RESTRICTIONS
...
When travel originates in a country for which a specific local
currency fares is published and the ticket is sold in another
country, the fare will be that published for the country of
origin converted to the currency of the country of sale at the
bank selling rate. The resultant fare must not be lower than from
the country of sale.
Exception: Not applicable for sales made and/or travel originating in Canada