Did you know that you can transact on a title that is subject to a Registrar's Caveat? There is no need for the Registrar/Landgate to be in the Workspace, but you might see this on the Participants screen - there is no need to do anything with this "Unrepresented Party".
Upon verification of the documents by Landgate, a warning should be displayed in the Documents screen referring to the Caveat, however, the transaction can proceed online as per usual.
Such dealings will, however, not be eligible for auto-registration, and will be diverted to the usual examination queue. This will mean that it will take a bit longer for registration to be finalised.