<rpc-error>
<error-type>application</error-type>
<error-tag>operation-failed</error-tag>
<error-severity>error</error-severity>
<error-message>Transaction commit failed on Failed to validate DataTreeModification 1 Cause: Node /(urn:ietf:params:xml:ns:yang:ietf-interfaces?revision=2014-05-08)interfaces/interface/interface[{(urn:ietf:params:xml:ns:yang:ietf-interfaces?revision=2014-05-08)name=neutron_port_11100002-0afa-41cc-8f2f-8d62b6e9bc1c}]/AugmentationIdentifier{childNames=[(urn:opendaylight:params:xml:ns:yang:unnumbered:interfaces?revision=2017-05-10)unnumbered]} does not exist. Cannot apply modification to its children.</error-message>
</rpc-error>
</rpc-reply>

InstanceIdentifier.create(Interfaces.class)
 .child(Interface.class, interfaceKey)
 .augmentation(InterfaceUnnumberedAugmentation.class)
 .child(Unnumbered.class);