The conditions of service relating to salary, gratuity, pension and other facilities of any civil employee prevailing at the time of his/her appointment shall not, without his/her consent, be so altered as to cause adverse effects on him/her. If any subsequent amendment causes adverse effects, in any manner, on such conditions of service of any civil employee who is already incumbent prior to such amendment, such amended
provisions shall not be applicable to him/her in absence of his/her written consent to the application of such provisions.