Hello,
Thanks Joao for explaining this.
Again, I would recommend you to check the dates (created and updated)
Configuring Symantec Endpoint Protection client for deployment as part of a drive image
Article: TECH102815 | Created: 2007-01-05 | Updated: 2010-01-22
This article was 1st Created and later on updated on 2010-01-22 that's during the Period of MR4MP2 and RU5.
Duplicate Hardware IDs result in only one client showing up in the Symantec Endpoint Protection Manager for two systems.
Article: TECH97626 | Created: 2009-01-20 | Updated: 2011-03-02
Check the Updated Article date, that's the reason, it says his problem is fixed in Symantec Endpoint Protection 11.0 RU5 (11.0.5002.333).