Group key is not widely used but it has nice feature. Once you group the field catalog fields and you pass the group name into parameter IT_SPECIAL_GROUPS of method SET_TABLE_FOR_FIRST_DISPLAY, then in ...
... from the table and you don’t pass the dictionary name to parameter I_STRUCTURE_NAME of SET_TABLE_FOR_FIRST_DISPLAY method, then it will only display this fields, which are in field catalog.
In Figure ...
... but this is only allowed if the table you would like to display is of type that is kept in dictionary. In other case, you’ll be forced to create the field catalog and pass it as parameter to SET_TABLE_FOR_FIRST_DISPLAY ...
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Can be used to fill EXCLUDE_FUNCTIONS table which is passed to SET_TABLE_FOR_FIRST_DISPLAY. As this works only before initial display, then alternatively DELETE_BUTTON function can be used which works ...