Of course, the donor of the power of attorney must put his signature on the power of attorney document. In addition, it may even have to be registered before the Sub-Registrar (which means also signatures of two witnesses) if it relates to power being given to sell any immovable property and also in certain other situations where the POA is for a transaction which is required to be registered. This is as per the requirements of Section 33 of the Registration Act. Further, the donor of the POA must be a person of sound mind and should be competent to enter into a contract, i.e., he should be an adult, etc.
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