BUP_S_RELS_DATA 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 "BP Relationships: Segment Data of a Shareholder Relationship" 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_BUP_S_RELS_DATA TYPE BUP_S_RELS_DATA.
The BUP_S_RELS_DATA table consists of various fields, each holding specific information or linking keys about BP Relationships: Segment Data of a Shareholder Relationship data available in SAP. These include CLIENT (Client), RELNR (BP Relationship Number), PARTNER1 (Business Partner Number), PARTNER2 (Business Partner 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. .