FMFG_SD_FIELDS 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 "Fiedls for U.S. Federal" 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_FMFG_SD_FIELDS TYPE FMFG_SD_FIELDS.
The FMFG_SD_FIELDS table consists of various fields, each holding specific information or linking keys about Fiedls for U.S. Federal data available in SAP. These include BETC (Business Event Type Code), MOD_ALLOW (Modification Allowed), CANCEL_ALLOW (Cancellation Allowed), PAY_METHOD (List of the Payment Methods to be Considered)... 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. .