Hi,
please add this code to your BADI
method IF_EX_MB_MIGO_BADI~LINE_MODIFY
if not GOITEM-EQUNR is initial.
flag = 'X'.
endif.
And in the PBO of the screen, please write these code logic to populate your field,
and import flag value here.
LOOP AT SCREEN.
IF SCREEN-NAME = 'name of screen'.
SCREEN-INPUT = '0'.
MODIFY SCREEN.
ENDIF.
ENDLOOP.