BSIS is a standard SAP Table which is used to store Accounting: Secondary Index for G/L Accounts data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The BSIS table consists of various fields, each holding specific information or linking keys about Accounting: Secondary Index for G/L Accounts data available in SAP. These include BUKRS (Company Code), HKONT (General Ledger Account), AUGDT (Clearing Date), AUGBL (Document Number of the Clearing Document)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .