Section 19(3)(a) in The Prevention of Corruption Act, 1988
(a)no finding, sentence or order passed by a special Judge shall be reversed or altered by a Court in appeal, confirmation or revision on the ground of the absence of, or any error, omission or irregularity in, the sanction required under sub-section (1), unless in the opinion of that Court, a failure of justice has in fact been occasioned thereby;