International trade relies on proper documentation. A certificate of origin (2) confirms where goods are produced, often required for customs clearance and to determine tariffs. A purchase order (3) provides formal buyer intent and agreement of terms, forming the basis for customs and logistics processes. Product quality statistics (1) and supplier financial position (4) are relevant for supplier selection and monitoring but not directly for import/export processes. Responsible sourcing requires procurement professionals to ensure correct documentation is used to avoid delays, penalties, or breaches of trade regulations.