it is not possible to remove a hardware node from OA. The following error is shown:
Host #123 is busy by services that are controlled by SC #40.
Some services are still present on this hardware node.
- Go to Infrastructure > Service Controllers and check what is SC #40 to understand what services cause the issue
- unprovision services from this hardware node (most likely it will be necessary to cancel/remove subscription(s) to do it)
- try to remove the hardware node again