EAM_S_TEXT_KEY_MAIN 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 "Main Text Key for Task List APIs: Mandatory Fields" 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_EAM_S_TEXT_KEY_MAIN TYPE EAM_S_TEXT_KEY_MAIN.
The EAM_S_TEXT_KEY_MAIN table consists of various fields, each holding specific information or linking keys about Main Text Key for Task List APIs: Mandatory Fields data available in SAP. These include PLNNR (Key for Task List Group), PLNAL (Group Counter)... 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. .