BAPI_STR_BUPA_FS_EXTERNID 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 Business Partner Number" 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_BAPI_STR_BUPA_FS_EXTERNID TYPE BAPI_STR_BUPA_FS_EXTERNID.
The BAPI_STR_BUPA_FS_EXTERNID table consists of various fields, each holding specific information or linking keys about Additional Business Partner Number data available in SAP. These include IDNUM (Identification Number for Business Partner)... 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. .