The CUDN creation based on example manifest fails with missing apiVersion.

4.19

Using a similar CUDN manifest file following the example in procedure step 1 in [1], the creation fails due to missing apiVersion provided.
[1] https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/virtualization/index#virt-creating-a-primary-cluster-udn_virt-connecting-vm-to-primary-udn

1. create a  CUDN definition file following the example manifest in [1]
2. oc apply --validate=true -f udn-cluster-udn.yaml
3.

error: resource mapping not found for name: "udn-cluster-primary-l2" namespace: "" from "udn-cluster-udn.yaml": no matches for kind "ClusterUserDefinedNetwork" in version ""

clusteruserdefinednetwork.k8s.ovn.org/udn-cluster-primary-l2 created

The example manifest file should be enhanced with the apiVersion declaration: 

apiVersion: k8s.ovn.org/v1