When you try to create/add an addon domain via CPanle, you may get this error message:

Error from park wrapper: Using nameservers with the following IPs: xx.xx.xx.xx,xx.xx.xx.xx Sorry, the domain is already pointed to an IP address that does not appear to use DNS servers associated with this server. Please transfer the domain to this servers nameservers or have your administrator add one of its nameservers to /etc/ips.remotedns and make the proper A entries on that remote nameserver.

There are two possibilities of this case: