S. 234B : Interest-Advance tax-Book profit-Precedent-Substantial question of law-Appeal-High Court-No interest under section 234B could be levied consequent to inclusion of various items in computing book profits as per Explanation to section 115JB inserted by Finance Act, 2008 with retrospective effect from 1-4-2001-Submission that cited judgment was “obtained” was objectionable-Binding precedents should not be suppressed or attempted to be attacked casually-Contention not raised before Tribunal and not even framed in memo of appeal cannot be question involved in appeal under section 260A [S. 115J, 260A]