Beginning with vCloud Director 8.20, a system administrator can create a system configuration setting that specifies one or more OVF ExtraConfig keys that can be included in OVF packages uploaded or downloaded by any user in a role that includes the new vApp: Allow Matching Extra Config right.
To enable the permissions set smbios.assetTag and disk.enableUUID, you need to enable the right, vApp: Allow Matching Extra Config, use the manage-config subcommand of the cell-management-tool, as shown here:
$VCLOUD_HOME/bin/cell-management-tool manage-config -n vapp.allowed.extra.config -v smbios.assetTag,disk.enableUUID
Note: You can specify one or more OVF ExtraConfig key names in the argument to the -v option. If you specify multiple OVF ExtraConfig key names, place a comma between the names.
To apply the configuration change,you will need to restart the cell.
For more information about specifying advanced virtual machine settings with ExtraConfig elements, see the vCloud API Programming Guide for Service Providers.