During the course of audit i have come across a situation where the auditee has deducted tax at normal rate from contractors and other parties eventhough the PAN Nos of such contractors/parties are not available at the time of deduction. Return has been filed without uploading the entries for which PAN was not available and clarified to us that a revised return will be filed soon as they have received the pan no of such parties now. It pertains to the second quarter of fin year 2010-11. My query is that when PAN was not available at the time of deduction is it not that the tax should have been deducted at a higher rate of 20%, can return 26Q be revised once it has been filed if so, what is the time limit with in which they can file the revise return.