[GustavoPZ]

*declare esto en mis variablles
DATA: g_repid TYPE sy-repid.
*agregue esto en su user command dentro del case
IF ref_grid IS INITIAL.
CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'
* EXPORTING
* IR_SALV_FULLSCREEN_ADAPTER =
IMPORTING
e_grid = ref_grid.
ENDIF.

IF NOT ref_grid IS INITIAL.
CALL METHOD ref_grid->check_changed_data.
ENDIF.