Who can make a complaint at CTTT?

Have recently been talking to someone at Fair Trading and others.

There seems to be a disagreement as to who is able to lodge an application to the CTTT.

Some people say it should be done by an Owner. Yet Fair Trading advises that a  person having an estate or interest in a lot of the Strata Scheme concerned may make an application

Can someone please advise how you interpret this?

It could be a common law partner perhaps or a partner or spouse of a lot Owner who is an Occupant or even a Mistress or whatever you call the men.

We’re having trouble trying to figure this out .

Help!!