BBPS_ES_USERNAME 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 "User Name" 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_BBPS_ES_USERNAME TYPE BBPS_ES_USERNAME.
The BBPS_ES_USERNAME table consists of various fields, each holding specific information or linking keys about User Name data available in SAP. These include IS_DEFAULT (New Input Values)... 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. .