S. 151: Reassessment-Sanction for issue of notice-Writ jurisdiction-The assessee had already challenged the assessment in appeal before the Commissioner (Appeals), writ petition challenging reassessment proceedings on the ground of absence of sanction under section 151 was not maintainable, though the assessee could raise such legal contentions before appellate/revisional authorities and the assessment order remained stayed meanwhile. [S.148A,151A, 246A, Art. 226]