S. 143(3): Assessment-Notice under S. 143(2) issued by ITO lacking pecuniary jurisdiction-Assessee participated in proceedings before Dy. CIT without objection-Objection raised for first time before Tribunal barred by S. 292BB-Tribunal erred in quashing assessment-Matter remanded. [S. 143(2), 254(1), 260A, 292B, 292BB]