Systems Management Server cannot update the dNSHostName property for the existing object "cn=SMS-MP-<site_code>-<site_server_name>" in Active Directory.  This property is used to publish fully qualified host names in Active Directory.

Possible cause: The Active Directory schema has not been extended with latest version of the SMS Active Directory classes and attributes.

Contributed By: Cliff Hobbs [MVP ConfigMgr/ SMS]
As the "Solution:" text is explaining, the reason you are seeing this error is because you haven't extended/ re-extended the AD Schema for SMS 2003 SP2. As a result SMS is unable to update AD with the FQDN entry for the Site's MP/ DP.

If you don't plan on extending the AD Schema you can safely ignore this error.

NOTE: You will see this error even if you haven't checked the "Specify a Fully Qualified Host Name" checkbox introduced in SP2 on the "General" tab under "Site Systems" in the Admin console as SMS assumes you will be using this.
 

To see other SMS 2003 Troubleshooting FAQs click here.