trees directory

The type tree that is contained in the trees directory represents the technical specifications of the ACH rules. These rules are defined in the appendixes of the Operating Rules of the National Automated Clearing House Association.

The ach_vccyy.mtt type trees and the ach_vccyy_sfmt.mtt (streaming-format) type trees are contained in this directory.

In the file names mentioned here, ccyy indicates the version of the ACH rules. The ACH technical specifications for the year 2010 are supported by the 2009 type tree. For details, see the release notes.