I executed /opt/novell/zenworks/bin/zenuninstall x -u Administrator -p xxx -a to uninstall the linux primary server.
And the end i got follow error

DEBUG 2013-12-17 14:26:55,499 - Performing post uninstallation tasks...
DEBUG 2013-12-17 14:26:55,499 - Cleaning up environment...
DEBUG 2013-12-17 14:26:55,499 - Uninstallation Complete.
DEBUG 2013-12-17 14:26:55,503 - The following errors occured during the uninstall:
DEBUG 2013-12-17 14:26:55,503 - UNABLE_TO_UNREGISTER (Code : 10)
[Footer]\r\n

The primary is still listed in the zone (retired).

Is it safe for me to just remove the object from ZCC?