Centralized procurement D365: global address book + vendors

Multi-legal-entity enterprises standing up centralized procurement on D365 Finance face a recurring master data problem. The same vendor gets purchases from multiple LEs, each with its own currency, tax rules, and approval hierarchy. Without discipline, the same vendor ends up configured three or four times - different addresses in each LE, different contact emails, different payment terms that don't actually reflect the contract. Teams reach for custom sync services or per-LE vendor duplicates.