Ok just checked myself to see if the asx has led me atray and...

Ok just checked myself to see if the asx has led me atray and unless someone can point out another rule:

ASX:

How settlement works

When you buy or sell financial products such as shares, you must exchange the title or legal ownership of those financial products for money. This exchange is called settlement.
Settlement takes place three business days after a trade occurs. For settlement through CHESS, payment and title exchange take place simultaneously.

How else do you think we can buy and sell within seconds if we didn't OWN the shares we'd just purchased - I'm still opened minded though that there exists a different rule

http://www.asx.com.au/services/settlement/asx-settlement/how-settlement-works.htm