Problem scanning custom built machines

Problem scanning custom built machines

Hi,
 
We recently distributed agent 1.05 to the workstations in our company through AD. However, everyone in one department has a custom built machine. These machines show as Model: System Product Name and  Service Tag: System Serial Number so whenever one machine scans it replaces any other custom built machine already scanned. Is there a way around this?  I tried to manually change the Service Tag in the asset information, but a new scan just resets it to "System Serial Number." Do we just need to remove the agent from those machines and manually scan them or is there an easier way to get all these machines to scan without replacing each other?
 
Thanks in advance for the help.

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