private void setBackward(Relation relation, boolean on, boolean notify) {
DirectedRelation directedRelation = contentMap.get(relation);
if (null == directedRelation) {
return;
}
if (on != directedRelation.matchBackward()) {
directedRelation.setMatchBackward(on);
// update the table
relationPicker.update(directedRelation,
new String[] {RelationshipPickerHelper.COL_BACKWARD});
if (notify) {