Effect of mistakes as to law :
Section – 21. A contract is not voidable because it was caused by a mistake as to any law in force in [India]; but a mistake as to a law not in force in [India] has the same effect as a mistake of fact.
[xxx]
Illustration
A and B make a contract grounded on the erroneous belief that a particular debt is barred by the Indian Law of Limitation; the contract is not voidable.
[***]