Thanks for the reply.

When I create a subsystem using the Subsystem icon, and go to the Property View, there is no stereotype.

When I create a package, and then add the <<subsystem>> stereotype, it's not shown with the Subsystem notation (the "pitchfork" icon inside the package "tab".

Does this mean that Jude understand Subsystems and Packages as "similar-looking", but completely different things?