(Yes I have administrator permission to change the settings).
I managed to do it, even with some difficulty, the PTC support guided me but they had hard times too.
The solution was to change the xml file "rule.xml", I sent it to the PTC support and then they gave it back to me (I do not know...
I know that there has been a thread on this subject but it has been closed, without a clear solution.
Well, I would need to change the number parameter of several CAD documents in PTC Windchill 10.2, but at the moment the number renaming field is greyed out.
I know there must be a setting...