Yes perhaps in some venues, they require the specification of the new survey. Some folks have simply applied to subdivide then never came back, which left the a blank spot on the plat map. Another issue is how property is classified an assessor after its paid off (public, commercial, residential, etc).You cannot unregister without specifying the new survey. Funny "unregister" and "unfile" have never passed any of the spellcheckers.