Hi Noel, just a quick note, haven't gotten arround to testing this but a quick look showed that this might indeed be the culprit.
Atm i have little time to test but there's others as well whom are working on this thing. It does give us the issue of changing the mod itself (as aposed to what we do now and offer both original and the tweaked mod) and i'm not sure if we would want to do that.
Anyways, will test this out soon, if anything just to give you the propor feedback ensuring it was not the checker itself.
thx man :-)
Noel, sorry for the late update man.
I can confirm it is indeed the lack correct of .veh entries that causes these errors.
Sadly that means we will not be able to use this mod for such upgrades but i thank you for your time and effort trying to help us out. Much appreciated!