S. 151 : Reassessment – Sanction for issue of notice –Shall be signed -Validity of reassessment – As per the CBDT Notification dated 31.03.2021, reassessment proceedings initiated prior to 01.04.2021 were to be governed under the old regime, and all functions were to be performed by the Jurisdictional AO- Sanction and jurisdiction is bad – Order of reassessment is quashed Unsigned sanction – Order is quashed and set aside . [ S. 120, 147, 148 ,149, 282A(1) R.127A(1) ]