Leafref validation is not working for Netconf Validate operation

[ArpitGupta05]

NETCONF Validate operation is returning error "Invalid leafref value" eventhough provided leafref data exists.

• DataModel: openconfig-network-instance.yang

module: openconfig-network-instance
  +--rw network-instances
     +--rw network-instance* [name]
        +--rw name                       -> ../config/name
        +--rw config
        |  +--rw name?                        string
        +--rw interfaces
        |  +--rw interface* [id]
        |     +--rw id        -> ../config/id
        |     +--rw config
        |     |  +--rw id?                            string
        |     |  +--rw interface?                     -> /oc-if:interfaces/interface/name

• Payload:

vrfbindc1.xml:
<network-instances xmlns="http://openconfig.net/yang/network-instance">
  <network-instance>
    <name>Vrf-1</name>
    <config>
      <name>Vrf-1</name>
    </config>
    <interfaces>
     <interface>
       <id>Ethernet4_int</id>
       <config>
         <id>Ethernet4_int</id>
         <interface>Ethernet4</interface>   ==> This is leafref to /oc-if:interfaces/interface/name
       </config>
     </interface>
  </interfaces>
  </network-instance>
</network-instances>

• Validate operation reported error "Invalid leafref value" even though provided leafref data exists.

> validate --src-config=/home/arpit/sonicp2/xml/xml_validate/vrfbind/vrfbindc1.xml
ERROR
        type:     application
        tag:      operation-failed
        severity: error
        message:  Invalid leafref value "Ethernet4" - no target instance "/oc-if:interfaces/oc-if:interface/oc-if:name" with the same value.

• Here Ethernet4 interface exists.

> get-config --source running --filter-xpath /interfaces
DATA
<data xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <interfaces xmlns="http://openconfig.net/yang/interfaces">
    <interface>
      <name>Ethernet4</name>
      <config>
        <name>Ethernet4</name>
      </config>
    </interface>
  </interfaces>
</data>