Approved exporter system of Japan-Mexico EPA effective April 2012

Approved exporter system in EPA with Mexico, which is self-declaration of goods origin by exporter, will be available to use on April 1st, 2012, according to the material issued by METI.

http://www.meti.go.jp/policy/trade_policy/epa/file/approved_exporter_procedure.pdf

So far, approved exporter system is available only to EPA with Switzerland and Peru.  Japan-Mexico EPA have been implemented since 2005.  By updating the agreement, exporter can make use of this self-declaration system by approved exporter in Japan-Mexico EPA.
There are certain criteria and requirements to be an approved exporter, please see the comprehensive guidance in above URL.