Creo 4.0 Error

[Bogdan]

Anybody have this error with Creo 4? And if yes how you manage it, I don't want to start with an older version of my model.

[Bogdan]

I think I found what is make Creo Simulate Save Error!

If you use "Save a copy" of an assembly for a Creo Simulate, the newly created copy will not be able to be saved after modifications.

The best way is to do a backup of the current version and rename it after that.