I have my first import of Users which is mapping the AD Attribute Serial Number with a new Attribute I created in System.User call Linked Serial Number. I have create and import of All Devices from LANDesk which also includes the Computer.System.Serial Number which is mapped to the Configuration Laptop serial number.
I have created a third import to link them using the following.
Key - User Configuration Item.Configuration Item.Title = Landesk Computer.Device Name
Key - User Configuration Item.Machine Name = Landesk Computer.Device Name
Key - User Configuration Item.User.Linked Serial Number
The import comes back successful but there is no linking to the end user.
With the Linked Serial Number attribute I created it under system.user and drag dropped it on User Configuration Item.
I got this working in an old database but obviously I am missing something.