I have the same question with duplicate Marks, they are allowed, but should they be.
My knee jerk reaction is that neither Marks or Routes should have duplicate names.
I could live with adding "*DUP*" to both. (There are some islands in Panama
that end in dup.)
The least desirable is to allow duplicate names.
Having said that, what too do about duplicate names that already exist? The easiest answer is that it's the users problem. After I have the fix installed I plan to go through my waypoint files and eliminate duplicates.
If you want to modify a route
and leave the original intact - simply 1. import
2.rename it, 3.modify it, 4.export it. If the route is already imported skip step 1. I dont think you need to be able to load a duplicate. You should get a warning that you are importing one.
Right now, you can import
duplicate routes but not duplicate waypoints. You can create duplicate names when creating waypoints and routes. Maybe we should do the check here as well?