BAPI1138_KFLIST 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 "Interface Structure: Stat. Key Figure Key and Text" 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_BAPI1138_KFLIST TYPE BAPI1138_KFLIST.
The BAPI1138_KFLIST table consists of various fields, each holding specific information or linking keys about Interface Structure: Stat. Key Figure Key and Text data available in SAP. These include STATKEYFIG (Statistical key figure), LONG_TEXT (Long Text)... 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. .