How to validate object with set of sub-objects

[tarto-dev]

Hello, I'm writing tests for API validation, and TV4 is very useful for this, but I can't find out how to check this JSon structure :
JSON SOURCE:

{  
   "count":5,
   "version":"1.0",
   "19":{  
      "prestationId":6225,
      "luluId":32,
      "craftsmanId":null,
      "status":"accepted"
   },
   "20":{  
      "prestationId":6225,
      "luluId":64,
      "craftsmanId":null,
      "status":"inactive"
   },
}

TV4 implementation

var schema = {
        "type": "object",
                "required": [],
                "properties": {
                    "prestationId": {
                        "type": "integer"
                    },
                    "luluId": {
                        "type": "integer"
                    },
                    "craftsmanId": {
                        "type": ["integer", "null"]
                    },
                    "status": {
                        "type": { "enum" : [ 'pending', 'accepted', 'refused', 'deleted', 'inactive'] }
                    },
                },
                "additionalProperties": false
    };

    var data = JSON.parse(responseBody);
    var result = tv4.validateResult(data, schema);

I just want to watch & validate sub-arrays, not the main one. I've try with $refs but it seems don't work with me.