This document describes relationships between SAP tables. It includes tables related to financial accounting (FI/CO), materials management, purchasing, accounts payable, accounts receivable, and more. Key tables described include BKPF, BSEG, MARA, KNA1, LFA1, EKKO, and EKPO. Graphical representations show relationships like one-to-one, one-to-many, and transparent versus cluster tables. The document is intended to help users understand how SAP database tables are linked.