20. Effect of acknowledgement or payment by another person.
(1) The expression “agent duly authorised in this behalf” in sections 18 and 19 shall, in the case of a person under disability, include his lawful guardian, committee or manager or an agent duly authorised by such guardian, committee or manager to sign the acknowledgement or make the payment.
(2) Nothing in the said sections renders one of several joint contractors, partners, executors or mortgagees chargeable by reason only of a written acknowledgement signed by, or of a payment made by, or by the agent of, any other or others of them.
(3) For the purposes of the said sections,-
(a) an acknowledgement signed or a payment made in respect of any liability by or by the duly authorised agent of, any limited owner of property who is governed by Hindu law, shall be a valid acknowledgement or payment, as the case may be, against a reversioner succeeding to such liability; and
(b) where a liability has been incurred by or on behalf of a Hindu undivided family as such, an acknowledgement or payment made by, or by the duly authorised agent of, the manager of the family for the time being shall be deemed to have been made on behalf of the whole family.