BPI001_DAT 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 "FS-BP: All Data Fields for BP001" 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_BPI001_DAT TYPE BPI001_DAT.
The BPI001_DAT table consists of various fields, each holding specific information or linking keys about FS-BP: All Data Fields for BP001 data available in SAP. These include TITLE_LET (Salutation), GROUP_D (Target Group), PAR_REL (Business Partner Released), VIP (Business Partner Is VIP)... 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. .