Clone a vm sharing disk

Mon Jun 27 14:09:58 UTC 2022

Hi, I have a vm with a qcow2 disk hosted on a btrfs file system.
Looking at the documentation it seems always possibile to create a clone
and share the source disk:

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/virtualization_administration_guide/cloning_vms_with_virt-manager

But I can't do it!
The options is "grey".
What am I missing?

Virt-manager 2.2.1
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