Procurement Manager creates and issues PO in Odoo → PO sent to supplier
Supplier receives PO → Identifies discrepancies → Supplier contacts procurement department → Procurement department amends and reissues PO
Goods received → Procurement Manager verifies quantity against PO
Quantity discrepancy → Procurement Manager contacts supplier to resolve
Invoice received → Procurement Manager verifies invoice against PO
Discrepancy → Notify supplier for correction
Payment → Payment only after invoice matches PO