BAPIFRML_CHAR_USAGE 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 "Additional Information - Value Assignment Usage" 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_BAPIFRML_CHAR_USAGE TYPE BAPIFRML_CHAR_USAGE.
The BAPIFRML_CHAR_USAGE table consists of various fields, each holding specific information or linking keys about Additional Information - Value Assignment Usage data available in SAP. These include FLGPRIMKEY (Creation of New Data Record with Artificial Primary Key), FOREIGNKEY (Artificial Foreign Key for BAPI Formula Objects), FLGFRGKEY (Creation of New Data Record with Artificial Foreign Key), LINEMODE (Processing Status/Mode of a Record/Step Loop Line)... 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. .