BAPI_0051_SELVALTYPE 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 "Selection criteria for value type" 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_0051_SELVALTYPE TYPE BAPI_0051_SELVALTYPE.
The BAPI_0051_SELVALTYPE table consists of various fields, each holding specific information or linking keys about Selection criteria for value type data available in SAP. These include OPTION (Selection operator OPTION for range tables), LOW (BCS Value Type), HIGH (BCS Value Type)... 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. .