CEST4_FLAG 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 "Assigned Characteristics" 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_CEST4_FLAG TYPE CEST4_FLAG.
The CEST4_FLAG table consists of various fields, each holding specific information or linking keys about Assigned Characteristics data available in SAP. These include AKTBO (Current profitability segment (CO-PA)), PAOBJNR (Profitability Segment Number (CO-PA)), PASUBNR (Profitability segment changes (CO-PA)), KNDNR (Flag: Characteristic Assigned Manually or Using TKEZU)... 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. .