The law does not permit a person to both approbate and reprobate. The principle is based on the doctrine of election which postulates that no party can accept and reject the same instrument and that a person cannot say at one time that a transaction is valid and thereby obtain some advantage to which he could only be entitled on the footing that it is valid and then turn around and say that it is void for the purpose of securing some other advantage.
In the case of Zila Dastavej Lekhak Association v. State of U.P., (1996) 8 SCC 441, while considering the challenge to the validity of Rule 6(2) of the U.P. Document Writers License Rules, 1977 by the licencees, it was held as under:
“The members of the petitioner-Association, having become the licensees under the Rules, are bound thereby. Firstly, the petitioner – Association being consisting of the members who obtained license under the Rules, cannot challenge the Rules under which they come to operate. The very source under which they come to operate either survives or perishes under the Rules. They cannot challenge that part of the Rules which is unfavourable to them while at the same time, respecting the favourable part thereof since they have no independent right de hors the Rules. They cannot challenge the power of the Inspector General of Registration in making the rules regulating conditions of the document writers and the conditions under which they become eligibile to be document writers.”
In the cases of NCTE v. Shyam Babu Maheshwari, (2011) 2 SCC 412 and Krishna Kumar v. Union of India, (1990) 4 SCC 207 and Union of India v. Kailas, (1998) 9 SCC 721, Hon’ble Supreme Court held that once an employee has opted for the Contributory Provident Fund Scheme, his exercise of option was final and he is not entitled to change over to the pension scheme because the two schemes are entirely different. Janki Prasad v. State of U.P., 2017 (135) RD 525.