Insofar as the change of opinion is concerned, it is writ large from the records of the case. The Assessing Officer had specifically raised a query with regard to the supplies made in the domestic tariff area and the petitioner / assessee had given a detailed reply to the same. The Assessing Officer, after considering the reply furnished by the assessee, framed the assessment order in which, as we have pointed out above, he made specific references to exports in the domestic tariff area and / or constructive exports. While computing the claim for exemption under Section 10B, the Assessing Officer has included the supply made in the domestic tariff area, both in the main body of the assessment order as also in Annexure-A thereto, which was the calculation of the deductions. Therefore, it is absolutely clear that the Assessing Officer had applied his mind to the very issue which is now sought to be raised under Section 147 of the said Act. That would mean that the present venture of invoking Section 147 is nothing but a mere change of opinion, which is impermissible in law, as is well settled by a long line of decisions. The second point of the petitioner is also well taken that an audit party could not have commented on a point of law and, particularly, on an interpretation of Section 10B of the said Act.