Nested schema errors not comprehensive

[cdm6a]

When I attempt to call the following I seem to be receiving an error that is not as comprehensive as I would have hoped:

const SCHEMAS = {
  Amount: require('./schemas/Amount.json'),
  PositiveFloatString: require('./schemas/PositiveFloatString.json'),
  Party: require('./schemas/Party.json)
};

function validate(object, schemaName) {
  const options = {schemas: SCHEMAS, greedy: true};
  const schema = SCHEMAS[schemaName];
  if (schema === undefined) {
    throw new Error('schema not found for: ' + schemaName);
  }
  const validate2 = schemaValidator(schema, options);
  const isValid = validate2(object);
  if (!isValid) {
    return {
      isValid: false,
      errors: validate2.errors
    };
  }
  return {
    isValid: true
  };
}

validate({
        name: 'bob smith',
        amount: {
          currency: 'USD'
        }
      }, 'Party'));

Yields:

{ 
  isValid: false,
  errors: [{ 
    field: 'data.amount',
    message: 'referenced schema does not match' 
  }] 
}

Ideally I was hoping that it would tell me something along the lines of:

errors: [{ 
    field: 'data.amount.value',
    message: 'is required' 
  }] 

I was hoping someone might be able to tell me if this is a short coming of the library or if this is a shortcoming of my implementation / json references.

My schemas are as follows:
Party.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "Party",
  "title": "Party",
  "description": "Represents a single party to a payment.",
  "type": "object",
  "properties": {
    "name": {
      "$ref": "Account"
    },
    "amount": {
      "description": "How much this party will send or receive in the payment.",
      "$ref": "Amount"
    }
  },
  "additionalProperties": false,
  "required": ["name", "amount"]
}

Amount.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "Amount",
  "title": "Amount",
  "type": "object",
  "properties": {
    "value": {
      "$ref": "PositiveFloatString"
    },
    "currency": {
      "type": "string",
      "$ref": "Currency"
    }
  },
  "additionalProperties": false,
  "required": ["value", "currency"]
}

PositiveFloatString.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "PositiveFloatString",
  "title": "PositiveFloatString",
  "description": "A string representation of a floating point number",
  "type": "string",
  "pattern": "^[+]?[0-9]*[.]?[0-9]+([eE][-+]?[0-9]+)?$"
}