During search operation conducted in case of ‘H’ Group, a copy of ledger account of assessee was seized which provided details of unsecured loans. The assessee’s case was reopened.  In response to reopening notice, assessee filed return. Assessing Officer completed assessment under section 147 wherein returned income was accepted. Thereafter, Principal Commissioner invoked revisionary proceedings on ground that Assessing Officer failed to make necessary inquiries on issue of unexplained cash transactions which were recorded in assessee’s ledger account seized during search. On appeal the Tribunal held that  since whole case was framed based on material found during search, course of action was required to be taken under section 153C and not under section 148. Therefore, Assessing Officer had erred in invoking reassessment proceedings under section 147 and as such, subsequent cause of action based on invalid order was without jurisdiction  Revision order is quashed.(AY. 2017-18)