When adding a comment in Eden Editor.

The comment title text conflicts with an object attribute variable with the same text (name).

Example:

A helo is placed in the editor with vehicle var name: heli1

A comment is placed in the editor with comment title text: Heli1

Then trying to change the heli attribute class type produces the following error:

"Value of the attribute variable name is already used in a different entity".

It is treating the comment title text as a vehicle var reference.