This discussion concerns the validity of a property sale conducted in 2012 using a notarised, unregistered Power of Attorney (POA) granted in 2000. The buyer acquired the property from Mr. X, who acted on behalf of his brother Mr. Y, the registered owner. A key concern is whether Mr. X had the legal right to sell the property under the POA, especially if Mr. Y was alive and the POA hadn't been revoked. Transactions involving immovable property generally require registered documents, making a sale via a notarised POA potentially invalid. The buyer needs to ensure the title is rectified, potentially by obtaining a registered sale deed from the original owner or their legal heirs, before attempting to transfer the revenue records.