An unrealised FX gain or loss is exactly that, unrealised. It's...

An unrealised FX gain or loss is exactly that, unrealised. It's a translation impact, which goes both ways depending on the currency movement. When companies, which report in a different currency to their earnings, prepare their financial statements and calculate adjusted NPAT to distribute as dovidends, they strip out these effects. Because they are unrealised.

The impact on revenue is not unrealised, because they actually receive US$ and convert it to A$ but when it's a translation impact on balance sheet items, it's different