In such a situation, where the Assessing officer has incorrectly or erroneously applied law and income chargeable to tax has escaped assessment, the Revenue is not without remedy and resort to provisions of section 263 could have been made by the ld CIT. In fact, the revisionary jurisdiction u/s 263 is meant to deal with such type of cases where the ld CIT can step-in and correct the Assessing officer. In the instant case, the original assessment proceedings were completed vide order u/s 143(3) dated 29.02.2016 and therefore, the provisions of section 263 could have been invoked by the ld CIT by 31.03.2018. However, instead of invoking the revisionary jurisdiction u/s 263 by ld. CIT, the Assessing officer has assumed the jurisdiction u/s 147 of the Act by issuance of notice dated 28.02.2017. Interestingly, for such assumption of jurisdiction, the ld CIT has accorded the approval u/s 151 of the Act. It is therefore a case where matter was referred to the ld CIT for seeking his approval and the ld CIT instead of holding that the matter falls under section 263 and not under section 148 has given the approval u/s 151 of the Act which shows non-application of mind and mechanical grant of approval