The output is shown via OBJECT_TAB. You can append your custom field in RQMQMFE structure.
The output is being displayed via FORM call_listviewer_f14 in include MIOLXF14. You can create an implcit enhancement at beginning of subroutine to fill the customer and customer name in object_tab internal table.
You can modify ALV output by implementing customer exit inside function module IREP1_CHANGE_SETTINGS_ALV . The exit inside function module can be used to change layout/fieldcatalog etc.
Nabheet