BAPI_0036_SELPOSTDATE 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 "GM: Selection criteria for posting date" 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_0036_SELPOSTDATE TYPE BAPI_0036_SELPOSTDATE.
The BAPI_0036_SELPOSTDATE table consists of various fields, each holding specific information or linking keys about GM: Selection criteria for posting date data available in SAP. These include OPTION (Selection operator OPTION for range tables), LOW (Posting Date in the Document), HIGH (Posting Date in the Document)... 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. .