It means that the ILS for precision operations only operates in one direction, i.e. when landing on 4R (heading into 40 degrees, or towards the northeast). Coming in from the other direction (on to 22L, heading 220 degrees or towards the southwest), there is no precision ILS. The reason for this is that the majority of cases where the visibility/ceiling will be low enough to warrant CAT II or CAT III landings si when there is a northeast wind. Southwest winds usually are accompanied by higher ceilings and visibility.
Precision ILSs (Instrument Landing Systems) are very expensive to install and maintain.