Label in object.and()

[jorge-pascual]

When the engine generates an error because a object.and() fails, the label for keys isn't showed. For example:

schema = Joi.object().keys({
  CustomerName: Joi.string().min(1).required(),
  CustomerUniqueDebitMandateReference: Joi.string().label('Label1'),
  CustomerMandateSignatureDate: Joi.date().format('DD/MM/YYYY').label('Label2'),
}).and('CustomerUniqueDebitMandateReference', 'CustomerMandateSignatureDate');

Joi.validate({
  CustomerName: 'name',
  CustomerMandateSignatureDate: '12/02/2016',
}, schema, log);

Generates

value contains CustomerMandateSignatureDate without its required peers CustomerUniqueDebitMandateReference

instead of

value contains Label2 without its required peers Label1

Is that correct?