code: public void setRadiusDistanceUnits(com.google.api.ads.adwords.axis.v201809.cm.ProximityDistanceUnits radiusDistanceUnits) {
          this.radiusDistanceUnits = radiusDistanceUnits;
      }
docs: Sets the radiusDistanceUnits value for this Proximity.
  
  @param radiusDistanceUnits   * Radius distance units.
  <span class="constraint Required">This field is
  required and should not be {@code null} when it is contained within
  {@link Operator}s : ADD.</span>