A person who had bought residential/commercial property/agricultural land/ plantation property/farm house in India when he was an Indian citizen, can continue to hold that property without the approval of the Reserve Bank after becoming an OCI card holder. Also he can transfer residential or commercial property in India by way of gift to a person resident in India or to a person resident outside India and is a citizen of India or to an OCI card holder resident outside India.
For registering a document address proof is needed. So along with the sale deed or gift deed, you should enclose copies of address proof . The address proof recognizable by the department includes passport, ration card, A adhar card (UID), bank passbook containing the full address of the person, driving license etc. So you may use the OCI/PIO card along with PAN Card.