Diagnosis
You want to change open item management in the asset class.

System Response
It is possible to change this. However, this change will effect allfuture assets created in this class.
Assets already defined in the class will not be effected by thischange. If you want to change them, you will have to perform a masschange on all the assets.
Instead of changing the open item management indicator, you ought tothink about creating a new class.