This one I already tried without any effect to the mapping.
Any Idea how to implement this and what kind of coding is needed.
I tried to use a copy of the sap implementation in MSR_MEGUI_GRID_ENHANCEMENT
I did something like this.
METHOD if_ex_megui_grid_enhancement~map_metafield.
TYPE-POOLS mmmfd.
DATA: ls_entry TYPE mepo_s_metafield_mapping.
ls_entry-application = iv_application.
CLEAR ls_entry-modif.
ls_entry-tabname = 'MSR_MEPO_HEADER'.
ls_entry-fieldname = 'BSGRU'.
ls_entry-metafield = mmmfd_bsgru.
INSERT ls_entry INTO TABLE ct_mapping.