Assessee-company is  engaged in business of manufacturing and cut of polished diamond on job work basis and trading of diamonds and power generation through windmill. The Assessee claimed   deduction under section 80IA. Return was processed and assessment was completed under section 143(3). Re assessment notice was issued  on ground that during assessment year 2017-18, one windmill, i.e., power generating unit of assessee which was claimed as eligible unit for deduction under section 80IA(4)(iv) was not originally owned by assessee-company but same was undertaking of amalgamating company which was transferred under scheme of amalgamation with assessee.  On writ the Court held that   since  the assessee had duly disclosed all material facts during original assessment proceedings and Assessing Officer had examined claim under section 80IA(4)(iv) in detail by raising various queries which were duly answered by assessee and observation of Assessing Officer was based on assessment records,  reopening notice issued beyond a period of four years  is unjustified and   set aside.  (AY. 2014-15)