Cannot customise 'Configured System Provision' Dialog (possible bug?)

I am trying to customise the provision ‘Request’ dialog for Configured System. I made a copy of the ‘Sample Configuration Management Provisioning Dialog’ and tried to hide (‘ignore’) a couple tabs and fields as directed in the documentation.

For whatever reason the new configuration is not being picked up (it still displays everything). On the ‘All Dialogs’ page the ‘Name’ column has picked up my new configuration dialog name and ‘Default’ is set to ‘false’.

So I am not sure of this a possible bug?

Could someone at least confirm if this is a bug or not? that would really help so I at least know not to spend any more time trying to get this working…