Master data represents core shared business objects in SAP systems. Vendor and material master data are examples of important master data used as a base for transactions. Maintaining accurate master data improves transaction performance by reducing manual data entry. Vendor master records contain general, company code, and purchasing organization data about a vendor. One-time vendors require address entry during transactions since their data is not prefilled from a master record. Reconciliation accounts integrate subledger transactions to the general ledger. Partner roles define relationships between a vendor and other entities involved in transactions.