code: function getInvalidIncludesError (message) {
    var error = new Error(
      message || 'JSON API resource does not support `include`'
    )
    error.statusCode = statusCodes.BAD_REQUEST
    error.code = statusCodes.BAD_REQUEST
    error.status = statusCodes.BAD_REQUEST
  
    return error
  }
docs: Get the invalid includes error.
  @public
  @memberOf {RelationshipUtils}
  @param {String} message
  @return {Error}