slcli server cancel --immediate does not produce an error, but cancels server on its monthly anniversary. The cause of the problem is "old" logic in cancel_hardware method of harware.py. In SL API 4.0 harware.py place_order now only supports the fast server provisioning package (see version 4 notes: #469), but cancel_hardware is still looking for a 'bareMetalInstanceFlag' and using Billing_Item cancelService. It should use Billing_Item cancelItem instead