FMTABKIES is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Current Balances Determined for Day-End Closing by the Systm" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_FMTABKIES TYPE FMTABKIES.
The FMTABKIES table consists of various fields, each holding specific information or linking keys about Current Balances Determined for Day-End Closing by the Systm data available in SAP. These include BUKRS (Company Code), SAKNR (G/L Account Number), HBKID (Short Key for a House Bank), HKTID (ID for account details)... 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. .