Origin-based duty exemptions under India Australia ECTA require certificate upload and specific notification coding in Customs EDI. Importers must prefix Roman numerals I-IV to notification serials to claim duty exemptions, set Duty Type/Addl. Duty Flag where AIDC applies, and provide TRQ license details with scheme code 32 when required. Certificate of Origin must be uploaded as document code 861018 with Certificate Type MS and the Image Reference Number declared at item level; the system prevents reuse of the same CoO number across different Bills of Entry. Exporters must declare ORC/EPT/ECTAAU codes in the Single Window table for items under the Agreement.