I found an example in RHV documentation

Example 15.13. Creating a new direct LUN disk device on a virtual machine

So I tested it

curl --cacert '/etc/pki/ovirt-engine/ca.pem' \
--request POST \
--header "Content-type: application/xml" \
--header "Accept: application/xml" \
--user "admin@internal:xxzzyy" \
--data "
<disk>
    <interface>virtio_scsi</interface>
    <lun_storage>
        <type>fcp</type>
        <logical_units>
          <logical_unit id="3624a937054c59fab85624844000117f0">
          </logical_unit>
        </logical_units>
    </lun_storage>
    <shareable>true</shareable>
</disk>
" \
https://cmanager/ovirt-engine/api/vms/9a779f03-3f0c-442e-83a2-8b9d4b450c76/disks

But got this error

Any help?

Thanks