When creating our user defined groups most of our devices are resolving in CiscoWorks to their device name, but some are resolving to their ip address.
Eg, we create the user defined group, use the rule Device.HostName startswith "abcd", and we expect to see in the 'objectcs matching criteria' box our devices 'abcdrouter1' and 'abcdswitch1' like for the majority of our groups. But occasionally we just get the ip addresses of the two devices.
Its not (as far as we can tell) causing any issues, its just seems strange and we're wondering why this might be happening.
It wouldn't. The seed list (i.e. the one configured under Campus Manager > Admin > Device Discovery > Discovery Settings) is augmented by all of the devices in DCR. That is, all devices in DCR will become seed devices on the next discovery. So, if you do not have filters properly setup in the aforementioned configuration screen, you can potentially get a lot of devices you do not want.