S. 10A : Free trade zone–Export sale proceeds not received in India in foreign exchange within time specified-Assessee seeking extension of time-No extension of time allowed after period of six months from end of year and application not rejected—Amounts includible in export turnover though received belatedly-Disallowance of payments for failure to deduct tax at source enhancing taxable income of assessee—Entitled to exemption on enhanced income. [S. 40(a)(ia)]