Unable to associate a storage unit to a storage lifecycle policy

Hi,

I have a storage unit (StorageUnitA) that consists of one disk directly attached to a media server (Basic Disk). This storage unit is associated with a storage unit group Called "Storage_Pool_A".

I have another storage unit on the same media server but still not using it for anything.

I need to create a storage lifecycle policy and associate it with StorageUnitA, When I give the storage lifecycle policy a name and click "Add", I do not get the storage unit listed in the storage unit dropdown box. I'm also unable to type this manually. if I type OK, i get the error "Storage Unit Cannot be left blank. Please select storage unit".

Version is Netbackup 7.5.

Can someone please tell me what I'm missing here?