What license is need to edit Process Template?

In modifying the Eclipse Way Process for some Bugzilla import work item attribute customisation, I see the message "NOTE:Customization(sic) is unsupported by the server's license".

Since I've assigned myself various combinations of developer license etc, admin rights, all to no avail, is this something we are not allowed to do with the trial version, or is there something I can do to fix this?

thanks
Steve