Rules of origin determine eligibility for preferential tariff treatment requiring an exporter declaration and authority certification. Eligibility for preferential tariff concessions under the India Singapore CECA requires an exporter's Combined Declaration and Certificate confirming that each product was produced in the named country and meets the Chapter on Rules of Origin. Goods must be eligible in the importing Party, satisfy consignment conditions (direct consignment with limited permitted transit), and meet the specific origin criterion identified on the form (wholly produced, single country content percentage, ISCECA cumulative content, Product Specific Rules, or De Minimis). The issuing authority certifies the declaration after control and importing customs records whether preferential treatment is granted.