S. 144C : Reference to dispute resolution panel – Document Identification Number [‘DIN’] – Circulars issued by CBDT in exercise of its powers under Section 119 of the Act are binding on the revenue – DIN has to be generated for DRP proceedings -Order of Tribunal quashing the order is affirmed by High Court – No substantial question of law . [ S. 119, 143(3), 144(5), 260A ]