Whether a Power of Attorney is revoked when the Power of Attorney holder has an interest in subject matter?

When a Power of Attorney holder himself has an interest in subject matter the principal cannot revoke the power unilaterally. We can understand this with the help of an example.

Example: A gives power to B to sell A’s land and to apply the sale proceeds to amount due from A to B. A cannot revoke the Power of Attorney unilaterally under any circumstances. Section 202 of Indian Contract Act deals with this situation.