Refund can be filed under the category of 'Inverted Duty Structure' by the manufacturer who supplies to the Merchant Exporter at concessional rate of 0.1%. Such filing of refund is covered under Section 54 (3)(ii) of CGST Act which is as follows :-
Section 54 (3) of CGST Act Subject to the provisions of sub-section (10), a registered person may claim refund of any unutilised input tax credit at the end of any tax period :
Provided that no refund of unutilized input tax credit shall be allowed in cases other than -
(i) zero rated supplies made without payment of tax;
(ii) where the credit has accumulated on account of rate of tax on inputs being higher than the rate of tax on output supplies (other than nil rated or fully exempt supplies), except supplies of goods or services or both as may be notified by the Government on the recommendations of the Council
Sales/supply of goods to merchant-exporter at the rate of 0.1%, is neither nil rated nor wholly exempt. It is partly exempted supply..Hence eligible for refund claim under Section 54 (3)(ii) of CGST Act.