| (a) | - | any duty short-levied, not levied, short-paid or not paid, then the same may be paid voluntarily by the importer or exporter of such goods along with the interest under section 28AA; |
| (b) | - | duty paid in excess of that payable on such goods or whole of the duty paid, requiring refund, then, such revised entry shall be deemed to be a claim for refund under section 27. |