Best Practice of Asset management when performing an upgrade to a customer

Summary:

What is the best practice for managing the upgrade information in the Asset module?

Content (required):

We sell Machines with S/W. We might upgrade a customer's machine to a new version via SW upgrade in remote, without receiving the Machine back into stock.

What we currently do is we manually create a new Asset with an New Item number, same SN and assign the asset to eth customer. Then we go to the previous Asset and update it with 'customer asset end date'.

Is this according to best practice? Managing all this manually?

Version (include the version you are using, if applicable):