GMG_HEADER_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 "Grant Master Header 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_GMG_HEADER_FIELDS TYPE GMG_HEADER_FIELDS.
The GMG_HEADER_FIELDS table consists of various fields, each holding specific information or linking keys about Grant Master Header Fields data available in SAP. These include GRANT_DESC (Descriptive Text), GRANT_TYPE (Grant Type), GRANT_TYPE_DESC (Description of Grant Type), COPY_SOURCE (Source grant)... 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. .