When you scan a workstation with multiple MAC addresses, it picks up those multiple MAC addresses, but only one MAC address is displayed in the header information for the machine when you drill into it in the WebConsole.
Fixed in ZENworks Asset Management 7.5 Interim Release 8 or newer
Interim Releases can be scheduled to run automatically or can be downloaded manually at https://download.novell.com. The Interim releases can be set up within the ZAM Manager for the Task server to check the site on a scheduled basis, and download and apply them automatically. Please refer to the Help Section details of how to set up automatic downloads if desired.
Each interim release is cumulative. If Interim Release 8 is not available due to a newer interim release being placed on the website, be assured that the code needed is in the later release.