The following CRS provided in plugin/epsg-wkt do not exists in the official EPSG database: All CRS in the 40000-49999 code range. This include 42102 and 42304, which are tested in the plugin/epsg-wkt test suite as required by uDig.
We need to provide some mechanism which allow the user to use an official EPSG database, and add supplemental CRS if needed. The supplemental CRS could be specified by a WKT file like what the current plugin/epsg-wkt does. But the properties file would contains only the additional CRS instead of all of them.