S. 245D : Settlement Commission-Powers-Rectification of order-Interest under section 234B cannot be levied by passing rectification order-Advance tax-Waiver of interest-Entitled to reduce tax deductible or collectible at source while computing its advance tax-Interest on account of shortfall in payment of advance tax not leviable on such income-Assessments prior to Financial year 2012-13-Subsequent notification of Board will not affect consideration of applications pending on merits-Law prevailing on date of application applies.[S. 234A, 234B,234C, 245C, 245D(4),245F(1), General Clauses Act. 1897, S. 6, Art.226]