BUP_S_RELS_DATA_COMPLEX 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 "BPR: Segment Data Shareholder Relationship (Incl. BUT050)" 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_COMPLEX TYPE BUP_S_RELS_DATA_COMPLEX.
The BUP_S_RELS_DATA_COMPLEX table consists of various fields, each holding specific information or linking keys about BPR: Segment Data Shareholder Relationship (Incl. BUT050) data available in SAP. These include PARTNER1 (Business Partner Number), PARTNER2 (Business Partner Number), RELTYP (Business Partner Relationship Category), XRF (Business partner role definition instead of BP relationship)... 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. .