{
  "network-instances": {
    "network-instance": [
      {
        "name": "global-bgp",
        "config": {
          "name": "global-bgp"
        },
        "protocols": {
          "protocol": [
            {
              "identifier": "openconfig-policy-types:BGP",
              "name": "hc-bgp-instance",
              "config": {
                "identifier": "openconfig-policy-types:BGP",
                "name": "hc-bgp-instance"
              },
              "bgp-openconfig-extensions:bgp": {
                "neighbors": {
                  "neighbor": [
                    {
                      "neighbor-address": "10.25.1.9",
                      "config": {
                        "peer-group": "application-peers"
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST",
                            "config" : {
                              "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST"
                            },
                            "receive": true,
                            "send-max": 0
                          }
                        ]
                      }
                    },
                    {
                      "neighbor-address": "10.25.1.10",
                      "config": {
                        "peer-group": "application-peers"
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST",
                            "config" : {
                              "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST"
                            },
                            "receive": true,
                            "send-max": 0
                          }
                        ]
                      }
                    },
                    {
                      "neighbor-address": "127.0.0.2",
                      "config": {
                        "peer-type": "INTERNAL"
                      },
                      "timers": {
                        "config": {
                          "connect-retry": 10,
                          "hold-time": 90
                        }
                      },
                      "transport": {
                        "config": {
                          "remote-port": 17900,
                          "passive-mode": false
                        }
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST",
                            "config" : {
                              "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST"
                            },
                            "receive": true,
                            "send-max": 0
                          }
                        ]
                      }
                    },
                    {
                      "neighbor-address": "127.0.0.3",
                      "config": {
                        "peer-type": "EXTERNAL"
                      },
                      "timers": {
                        "config": {
                          "connect-retry": 10,
                          "hold-time": 90
                        }
                      },
                      "transport": {
                        "config": {
                          "remote-port": 17900,
                          "passive-mode": false
                        }
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST",
                            "config" : {
                              "afi-safi-name": "openconfig-bgp-types:IPV4-UNICAST"
                            },
                            "receive": true,
                            "send-max": 0
                          }
                        ]
                      }
                    }
                  ]
                }
              }
            }
          ]
        }
      }
    ]
  }
}

[...]
org.opendaylight.yangtools.yang.data.impl.leafref.LeafRefDataValidationFailedException:
Invalid leafref value [(http://openconfig.net/yang/bgp-types?revision=2015-10-09)IPV4-UNICAST] allowed values [] of LEAFREF node: (urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=2017-12-07)afi-safi-name leafRef target path: Absolute path:/(http://openconfig.net/yang/network-instance?revision=Optional[2015-10-18])network-instances/(http://openconfig.net/yang/network-instance?revision=Optional[2015-10-18])network-instance/(http://openconfig.net/yang/network-instance?revision=Optional[2015-10-18])protocols/(http://openconfig.net/yang/network-instance?revision=Optional[2015-10-18])protocol/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])bgp/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])neighbors/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])neighbor/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])afi-safis/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])afi-safi/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])config/(urn:opendaylight:params:xml:ns:yang:bgp:openconfig-extensions?revision=Optional[2017-12-07])afi-safi-name
    at org.opendaylight.yangtools.yang.data.impl.leafref.LeafRefValidatation.validate0(LeafRefValidatation.java:86) ~[yang-data-impl-2.0.5.jar:na]
    at org.opendaylight.yangtools.yang.data.impl.leafref.LeafRefValidatation.validate(LeafRefValidatation.java:60) ~[yang-data-impl-2.0.5.jar:na]
    at io.fd.honeycomb.data.impl.ModifiableDataTreeManager$ConfigSnapshot.commit(ModifiableDataTreeManager.java:112) ~[data-impl-1.18.10-SNAPSHOT.jar:na]
[...]