S. 263 : Revision-Erroneous and prejudicial to Revenue-Assessee a trust running engineering colleges-Anonymous donations in cash and demand drafts found during search-Receipts offered to tax and taxed under section 115BBC-Principal Commissioner invoking section 263 to deny exemption on capitation fees relying on decision stayed by Supreme Court-Assessment framed after full verification-Twin conditions for section 263 not satisfied-Revision void ab initio-Precedent-Distinction between “stay” of order and “quashing of order”-An order stayed does not become operative from the date of the stay order, whereas quashing restores the position as it stood prior to the order quashed.[[S. 11, 12AA, 115BBC, 153A]