holas..al crear tu alv pusistes estos metodos..?
estos te validan el ingreso k haces..
* validar al modificar el campo
CALL METHOD grid_min->register_edit_event
EXPORTING
i_event_id = cl_gui_alv_grid=>mc_evt_modified.
* validar al dar enter
CALL METHOD grid_min->register_edit_event
EXPORTING
i_event_id = cl_gui_alv_grid=>mc_evt_enter.
CALL METHOD grid_min->set_ready_for_input
EXPORTING
i_ready_for_input = 1.
saludos
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