Customs origin compliance requires sanctioned enforcement and strict certificate of origin, with exporter and producer documentation obligations. Rule 36 mandates that each Party enforce civil, administrative and where appropriate criminal sanctions for violations of customs laws governing tariff classification, customs valuation, rules of origin and entitlement to preferential tariff treatment. The Appendix prescribes Certificate of Origin form specifications, issuer controls, required exporter and producer declarations, mandatory content (including description, HS code, origin criterion, invoices and endorsements), obligations to retain supporting documentation, and duties to submit evidence and accept inspections to substantiate origin claims.