MDST_LOAD_API_DATA_ID_FL 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 "Fld Names" 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_MDST_LOAD_API_DATA_ID_FL TYPE MDST_LOAD_API_DATA_ID_FL.
The MDST_LOAD_API_DATA_ID_FL table consists of various fields, each holding specific information or linking keys about Fld Names data available in SAP. These include ID_SEL_FIELD (Field Name)... 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. .