CORBA35 — CosConsurrencyControl service bug or not?

I develop CosConcurrencyControl service for JacORB, but I don't
understud from specification how client can destroy LockSet.
When I create Object which allow concurrency access, I create LockSet.
When I destroy this Object I must destroy LockSet, because it's garbage,
bu no way for this does not exists.

As solution of this problem, I add in CosConcurrencyControl.idl next
changes:
exception LockExists{};

and method
void destroy raises (LockExists);

in interface LockSet.

As I undestand this changes is wrong, but have you idea about desigion
this problem.