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.
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.