Thanks guys.
If anyone is interested in doing it themselves, I tracked down the form you need to make the adjustment.
http://www.ato.gov.au/content/downloads/2843_07_2006.pdf
Cheers.
Let's say "a friend of mine" made a mistake on their tax return and didn't include a significant deduction, is it possible to re-claim for the applicable year?
If not do you know of any process that allows you to adjust a claim in any way?
Thanks.