curl -X 'POST' \
  'http://localhost:8181/rests/data/network-topology:network-topology/topology=topology-netconf/node=36001-sim-device/yang-ext:mount/toaster-example:lst=data/cont1/cont11' \
  -H 'accept: */*' \
  -H 'Content-Type: application/json' \
  -d '{
  "lf111": 0,
  "lf112": "Some lf112"
}' 

{
  "errors": {
    "error": [
      {
        "error-tag": "operation-failed",
        "error-info": "Normalized Node result was already set.",
        "error-message": "Error parsing json input: Failed to create new parse result data. Are you creating multiple resources/subresources in POST request?",
        "error-type": "application"
      }
    ]
  }
} 

  "post": {
    "deprecated": false,
    "tags": [
      "36001-sim-device toaster-example"
    ],
    "parameters": [
      {
        "name": "lf1",
        "in": "path",
        "required": true,
        "schema": {
          "type": "string"
        }
      }
    ],
    "requestBody": {
      "content": {
        "application/json": {
          "schema": {
            "properties": {
              "cont11": {
                "$ref": "#/components/schemas/toaster-example_lst_cont1_cont11"
              }
            }
          }
        },
        "application/xml": {
          "schema": {
            "$ref": "#/components/schemas/toaster-example_lst_cont1_cont11"
          }
        }
      },
      "description": "cont11"
    }
  }

  "toaster-example_lst_cont1_cont11": {
    "properties": {
      "lf111": {
        "description": "",
        "type": "integer",
        "example": 0,
        "format": "int64",
        "uniqueItems": false
      },
      "lf112": {
        "description": "",
        "type": "string",
        "example": "Some lf112",
        "uniqueItems": false
      }
    },
    "xml": {
      "name": "cont11",
      "namespace": "http://netconfcentral.org/ns/toaster/example",
      "attribute": false,
      "wrapped": false
    },
    "description": "",
    "title": "toaster-example_lst_cont1_cont11",
    "type": "object"
  }