SDPARTNER_ADMIN 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 "Partner Administration Data in SD Partner Processing" 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_SDPARTNER_ADMIN TYPE SDPARTNER_ADMIN.
The SDPARTNER_ADMIN table consists of various fields, each holding specific information or linking keys about Partner Administration Data in SD Partner Processing data available in SAP. These include VBELN (Sales and Distribution Document Number), POSNR (Item number of the SD document), PARVW (Partner function), ROLETYPE (Function types in SD partner processing)... 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. .