S. 148A: Reassessment-Conducting inquiry, providing opportunity before issue of notice-Assessing Officer issued on assessee notices under section 148 dated 8-4-2021 seeking to reopen assessment for assessment years 2015-16 and 2016-17-Mandatory procedure of a prior inquiry under section 148A had not been followed-notices were unsustainable in law and quashed-Sanction-Sanction of Additional Commissioner and not only from Principal Chief Commissioner-Notice was quashed. [S. 148, 151, Art. 226]