S. 263 : Commissioner – Revision of orders prejudicial to revenue – Land development expenditure-Explanation 2 to s. 263 inserted by the FA 2015 (which confers power upon the CIT to revise assessments where inadequate inquiries have been conducted by the AO) is prospective in nature and does not apply even to a case where the CIT passed the order after Explanation 2 came on the statute- Revision is held to be not valid unless the CIT demonstrate that the view taken by the AO is unsustainable in law .