As it has been voted and decided that every contribution of combo 3D discs are to be contributed has alway we have to contribute both dimensions on the main profile child profil for 2D disc. However this procedure does not tell what kind of Edition we dealing with and I noticed 3 kinds of those.

First kind: Separate discs (1 Disc for the 3D and 1 Disc for the 2D)
              Example: Tron Legacy

Second Kind: Hybride disc Loked ( Single disc that can play both version however impossible to select wich one that will depends on what player you'll play the disc.)
              Example: Kung Fu Panda (Best Buy exclusive)

Thrid Kind: Hybride disc Unlocked (Single Disc that carry both version and it is possible to select wich version you want to play)
              Example: The Smurfs

There is no way for the moment to distinguish those discs apart so I wonder if we put our mind toghether if we could find a way to see it is lighly possible to include this information somewhere now or in the future.

Later we could vote on how to implement this if we decide to do it of course.

There was a vote in the rules forum. It isn't codified. There actually is a way to distinguish. The first kind will have child profiles and separate 2d and 3d discs in the discs field. I'm not sure if the distinction between the second and third kinds is meaningful.