Ahh yes the OBED error. Believe Ive had some experience with that one. I only use the group function when exporting. But thats what I was told to do. That may be the problem with the Makemdl error Im getting that wont allow me to export my current project through FS9 Makemdl. The Interior model exports fine but my Exterior is giving me fits.
Would you agree that where you get OBED error is from grouping parts and then scaling them to a different size? Then ungrouping. Seems thats what I did.
So you should always just select all the parts as individuals you wish to scale/clone. In a loose selected group and not by using the group tab.
Just pretend the "Group" button isn't there. Do not - repeat NOT - ever use it again...
For both FS9 and FSX, the
correct, SDK approved technique is to use two top level hierarchy nodes: "exterior" and "interior" to keep your model organized. These are "keywords" that're recognized by MakeMDL.exe automatically.
IOW:
exterior
....all the parts for the exterior model are Linked here
interior
....all the parts for the interior model are Linked here
----------------------
When wishing to scale any object,
always scale one of the sub-object levels, such as Vertex, Faces, Polygon, or Element.
I you really, really, REALLY want to scale at the object level, then for heaven's sake add an X-Form modifier to the stack beforehand.

BTW, a quick way to remove "Scale Errors" from a large group of objects (such as the one you had me look at), select all the parts, add an X-Form modifier to the stack, then click on Hierarchy/Scale/Reset.