code: public void setRetractionDetails(com.google.api.ads.admanager.axis.v201902.RetractionDetails retractionDetails) {
          this.retractionDetails = retractionDetails;
      }
docs: Sets the retractionDetails value for this RetractProposals.
  
  @param retractionDetails   * {@link RetractionDetails Details} describing why the {@link
  Proposal} is being retracted.