At the right of the field there is written:

I'll precise "0-9 digits only".
I can replace that by something easier to understand if you provide me a better one...

That was actually the first thing I did, and it didn't work. Thanks for the help, anyway.

I had the same problem here. As explained by Sandie and antp, the Mk field must be filled with digits only, not with I / II nor with a / b...
The script translates it then in roman numbers, or, if I'm not mistaken, in letters for Opel.
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If Ddey65 is Ok with it, could a forum moderator rename that thread How to fill the Mk field when adding a new vehicle or something like that? This problem seems to occur regularly, so it could be helpul to find it more easily in the forum?
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Edit: Oops, I should have refreshed the page before posting. You were once again faster than me, Sandie

Put a number '2' in the MK field (between chassis and class fields).

I've fixed it.

I've been having a big problem with adding the names to those Ford Capris of the 1970's that were made in what was then West Germany and sold in Lincoln-Mercury dealerships; How do you load the "MkI" and "MkII" designations so they show up in the proper places? Prime example here:

http://www.imcdb.org/vehicle_813433-Capri-MkII-1976.html

I've moved the MkII designation every possible way, but it never shows up the way it should.