private boolean validateNegotiationMassChange(PersonMassChange personMassChange) { boolean isValid = true; NegotiationPersonMassChange negotiationPersonMassChange = personMassChange.getNegotiationPersonMassChange(); if (negotiationPersonMassChange.isNegotiator()) { isValid &= validatePerson(personMassChange, NEGOTIATION_NEGOTIATOR_FIELD, NEGOTIATION_NEGOTIATOR); } return isValid; }