IGST paid in case of EPCG license during interim period July 2017

Dear Sir/Ma'am


we have paid IGST against EPCG Authorization during interim period of 2017 .we have not claimed the refund of the IGST.

1. whether we have to apply for refund?
.2. or our export obligation will be reduced proportionately to the amount of IGST.

Thanks in advance ☺️🙏