How can I detach then reattach a SiteManager license to my HMI?

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In order to detach a SiteManager license from an HMI registered in the GateManager, right click on the device in the web UI of the GateManager, then select "Delete appliance".

Since then, SiteManager license of the deleted device will be released so that it can be reused by another HMI.

NOTE: WHEN A LICENSE IS DETACHED FROM AN HMI, IT CANNOT BE ATTACHED TO ANOTHER HMI BEFORE 24 HOURS.