public static void setSimpleListModelConfig(final String saveId, final String config) {
        putStringDirect(getKey(R.string.pref_simple_list_model_config) + "." + saveId, config);
    }
should SOLELY be called by class {@link cgeo.geocaching.ui.SimpleItemListModel
main/src/main/java/cgeo/geocaching/settings/Settings.java