From 1 June 2015 CERs, ERUs and RMUs (in fact most Kyoto Protocol units) will no longer be eligible for surrender to meet obligations in the Emissions Trading Scheme (ETS). For more details click here
If you are a forest owner trying to use ERUs to extinguish a qualifying liability, simply purchasing units does not complete the process. Units cna only be surrendered by logging into the emissions unit register, selecting the relevant surrender notification and surrendering the requisite number of then eligible units to the Crown account before the end of May 2015.
Thanks to Carbon Match http://www.carbonmatch.co.nz for parts of this content