I found this note:
When a CLI create operation (such as scope name create arguments) fails, the CLI might not have removed this object from its internal cache when responding to a prior delete command and, thus, a subsequent create operation (with corrected arguments, for example) might return a 314 Duplicate object error. To resolve this, issue a save command (which saves any pending changes and flushes the CLI's internal cache), then reissue the create operation.
The syntax is correct:
zone name addHost hostname IPaddress [alias...]
Referenced from :
http://www.cisco.com.ru/en/US/docs/net_mgmt/network_registrar/5.5/command/reference/CLI2.html#wp1592227I'm sure its something simple, maybe a process out of order or something. Might be one for the TAC....