The document provides a list of important tables used in SAP FI (Financial Accounting) modules. It includes tables for the general ledger, accounts receivable, accounts payable, asset accounting, bank accounting, and validation/substitution rules. Some of the key tables listed are BKPF for document headers, KNB1 for customer master, LFA1 for vendor master, SKA1 for the chart of accounts, and ANKA for asset classes.