CORBA35 — methods on the POA

A lot of the methods on the POA which have USE_DEFAULT_SERVANT or USE_SERVANT_MANAGER as policies don't describe in detail what should happen when one of these policies is set, but no default servant/servant manager is set. For example reference_to_servant, when USE_DEFAULT_SERVANT is set and default servant is registered we return the default servant, but what when no default servant is set, is then the ObjectNotActive the correct exception? Shouldn't this be something like a system exception (bad inv order, obj adapter or something like that?)