BBP_EKKO_KEY 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 "Key for Table Purchasing Document Header" 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_BBP_EKKO_KEY TYPE BBP_EKKO_KEY.
The BBP_EKKO_KEY table consists of various fields, each holding specific information or linking keys about Key for Table Purchasing Document Header data available in SAP. These include EBELN (Purchasing Document Number)... 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. .