F50F 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 "Screen fields for TRX FNQ3 and FNQ4" 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_F50F TYPE F50F.
The F50F table consists of various fields, each holding specific information or linking keys about Screen fields for TRX FNQ3 and FNQ4 data available in SAP. These include BRANL (Contract Number), VBUDAT (Posting Date in the Document), BBUDAT (Posting Date in the Document), VSBEWART (Flow 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. .