NetApp Cluster-Mode and NDMP

I am in the process of configuring NDMP backups against a NetApp cluster using the node-scope-mode enabled option set to on. When I add the NDMP host in the NetBackup console, I can only add it by IP address. If I try and add the hostname, it reverts to the IP address when I save it. Is there any way around this? The hostname is in DNS and I've tried using host file entries on the master and media servers as well. If I use the IP address, the backup runs successfully, but I don't want to be stuck with an IP address for a host when it comes to restores.