One of the administrator left the organization and when deleting his user ID, we are getting following error.
Platform : SMG 10.0
Error : Cannot delete this administrator account as it is associated with a client certificate.
Note : This is not the default ID, that is shipped with the bix.
We have also check the KB article.
http://www.symantec.com/business/support/index?page=content&id=TECH217638