code: public void setSystemServingStatus(com.google.api.ads.adwords.axis.v201809.cm.SystemServingStatus systemServingStatus) {
          this.systemServingStatus = systemServingStatus;
      }
docs: Sets the systemServingStatus value for this BiddableAdGroupCriterion.
  
  @param systemServingStatus   * Serving status.
  <span class="constraint ReadOnly">This field is
  read only and will be ignored when sent to the API.</span>