SAP ERP software was founded in 1972 by 5 former IBM engineers. It has financial accounting and controlling modules to track financial transactions and analyze profitability. The organizational structure in SAP defines finance reporting units like business areas, profit centers, and company codes. Master data includes this structure and defines accounts, vendors, customers and more. Transactions then use this data. Documents in SAP have header fields like document number and date, and line items with account types and debit/credit indicators to define specific entries. Document and posting types control valid configurations at the client level.