Latest Answer: Righ Sir,
It is advised to go register as per market value and have peaceful nights sleep. Why? Because, when you sell your property in future , you have to pay the tax on the profits made. And the profit is decided by your cost of the house and the sell price. So lower the cost of your house, the higher the profits on paper for you in future. You might be aware of the fact that indexation is applied in case of real estate transactions and 20% tax is paid on the profit.