There are 2 separate issues, the maps, and the actual processing. The maps in Gentran can be VM, or AI depending upon when you bought Gentran, and what version was purchased. If you have an old version, the maps are VM (visual Maps). If you have a newer version, the maps are AI (Application integration. If you have an older version and have upgraded, you might have both. I have both, and according to what the instructor told me during my class, neither of these can be used in GIS natively, both map types must be rewritten, or converted to GIS AI maps. We were told that there is a tool in GIS that can help with this conversion, but each map will probably need work.
The processing in Gentran is completely different than in GIS. To process the EDI data in GIS, will require a new implementation in GIS, and none of the “Data manager” functions exist in GIS.