part of my yaml:

iser:
      description: 'High performance block storage: Cinder volumes ove
+r iSER protocol
        (iSCSI over RDMA). This feature requires SR-IOV capabilities i
+n the NIC, and
        will use a dedicated virtual function for the storage network.
+'
      label: iSER protocol for volumes (Cinder)
      restrictions:
      - settings:storage.volumes_lvm.value != true or settings:common.
+libvirt_type.value
        != 'kvm'
      type: checkbox
      value: true
      weight: 11
    metadata:
      label: Storage
      weight: 60
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my $yaml_hash_ref = YAML::XS::LoadFile($test.yaml);
$yaml_hash{editable}->{storage}->{iser}->{value} = $use_iser_protocol;
+ # whatever i put here i get error cannot modify readonly.
YAML::XS::DumpFile("$tmp_file",$yaml_hash_ref);
[download]

what im trying to do i modify a yaml file and set specific value to be true instead of false.