GST Refund

Yes you can export under LUT while another export can be on Payment of IGST. you can claim refund of IGST paid on the export . since there is no bar on such transactions. You can also ship under LUT in one month and export under claim of rebate on payment of IGST in another month.

The refund of IGST is allowed only after payment of taxes and filing of the returns.

Thank you for valuable reply