Cisco-IOS-XR-ipv4-smiap-cfg module: Error "mandatory leaf missing from request" but configuration of leaf is given

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Expected Behavior

Configurations for IPv4 virtual address for management interfaces should reply with ok

Current Behavior

No ok in reply received from device. (RPC reply as mandatory leaf missing from request)

Steps to Reproduce

1. Configure the IPv4 virtual address for management interfaces.
2. Received RPC error as "mandatory leaf missing from request"

Your Script

        obj_smiap = ipv4_smiap_cfg.Ipv4Virtual()
        obj_smiap.use_as_source_address = Empty()
        obj_vrf = obj_smiap.Vrfs.Vrf() 
        obj_vrf.vrf_name = "default"
        pdb.set_trace()
        obj_address = obj_vrf.Address()
        obj_vrf.address = obj_address
        obj_address.address = "192.168.10.23/8"
        obj_address.netmask = 24
        obj_smiap.vrfs.vrf.append(obj_vrf)
        crud_service.create(provider, obj_smiap)

Logs

ydk.errors.YPYServiceProviderError:  <?xml version="1.0"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <rpc-error>
    <error-type>protocol</error-type>
    <error-tag>missing-element</error-tag>
    <error-severity>error</error-severity>
    <error-path xmlns:ns1="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-smiap-cfg">ns1:ipv4-virtual/ns1:vrfs/ns1:vrf[vrf-name = 'default']/ns1:address/ns1:address</error-path>
    <error-info>
      <bad-element>address</bad-element>
      <error-message>mandatory leaf missing from request, please add it and try again.</error-message>
    </error-info>
  </rpc-error>
</rpc-reply>

Full logs are attached in file: ipv4_smiap.log

System Information

Python Version 2.7
Route Operating System: CISCO-IOS-XR
ipv4_smiap.log

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Similar to #598 (same model, different container). See closing comments for #598