The Asia desk at an FCM called me a few minutes ago, telling me that I had placed an order at an illegal price. It seems the Sydney Futures Exchange (a division of ASX) has changed the Tick size of the 3-Year Australian Government Bond futures, CSI symbol "YTT".
Here is the announcement, of which I was blissfully unaware until today: http://www.sfe.com.au/content/notices/2 ... 09_071.pdf