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The confusion is in the term benchmark, you cannot establish or otherwise change a benchmark that is registered, however, the term is also used for temporary benchmarks especially for elevations, in which case you can. For example you may set a elevation benchmark on a site from which to reference the elevations of structures on the site.  But these are not registered.  I believe when they refer to elevation (Reza) you can do it, if they dont refer to elevation (Mansour) you cannot.