Unscanned workstations disappear from Assets

Unscanned workstations disappear from Assets

Is it possible to prevent workstations that have not been scanned (i.e. not on the network) for a length of time from dropping out of the list of Assets?   

The reason being that some of the asset info then has to be re-entered and software licenses re-assigned when it is next detected.

The workstation is still in existence and in Active Directory, but just not been powered on for some time.

Thanks.

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