psppire_selector_set_allow (PSPPIRE_SELECTOR (dep_sel), numeric_only);
psppire_dialog_action_set_valid_predicate (pda, (void *) dialog_state_valid);
psppire_selector_set_allow (PSPPIRE_SELECTOR (dep_sel), numeric_only);
psppire_dialog_action_set_valid_predicate (pda, (void *) dialog_state_valid);