S.115BBE: Tax on income referred in section 69-Survey -Surrender of excess stock – Prevailing price of gold had fallen as on 31-3-2013- Unexplained investments – Loss is allowed to be set off against income disclosed in the course of survey -Provision is applicable with effect from 1-4-2017 which h is prospective and not prior to that -Remanded for verification whether entire excess stock found in the course of survey remained unsold as on 31-03 -2103 .[ S. 69 , 133A ]