I can only assume that the "production activity" was some crappy Z-program or SQL statement which hit the wrong field in USR02 or did not respect the release dependent application dependencies of the single fields of the table.
So you created this mess and your customer is responsible for it by expecting you to get it right without checking that you know what you are doing.
You must get yourself an expert consultant to fix this problem if you hobbled the database.
Note that SAP will probably also only offer you the option of cancelling support (good luck!) or consulting if you do such things.
It is not application support. But it is interesting SCN discussion.
Perhaps you can tell us more about the problem? How did it happen? Perhaps I am wrong?
Cheers,
Julius