Roo Service stopping Roo from scaffolding web mvc controllers

My Roo project has some entities and their web controllers, all Roo managed.
I also have a Service, scaffolded from Roo, to do some cross-domain processing.
The service method produces a non persistent entity called BookableRoom, summarizing the processing result. This entity is a fake JPA Active Record managed by Roo (please see suggestion).
I also built a web controller BookableRoomController and views, scaffolded from Roo and then totally managed from me (no more @Roo annotations in it).

Now the problem: I added some Roo managed new entities, but "web mvc all..." refuses to scaffold their web controllers and views, saying "Undo manage...", "Undo create..." about the controllers to be scaffolded.

If I remove the autowired service from my BookableRoomController, then Roo scaffolds everything (even my existing BookableRoomController, which is right: I asked "all").

How comes a service inside a controller affects other entities' controller scaffolding?
Anyone experienced such behaviour?
Is it right, and maybe I'm doing something wrong?
Is the command execution a transaction, and the issue regarding the autowired service triggers a rollback? (undos)