code: public void setBuiltInRoadblockingType(com.google.api.ads.admanager.axis.v201902.RoadblockingType builtInRoadblockingType) {
          this.builtInRoadblockingType = builtInRoadblockingType;
      }
docs: Sets the builtInRoadblockingType value for this ProposalLineItemConstraints.
  
  @param builtInRoadblockingType   * The built-in roadblocking type for the created {@link ProposalLineItem}.
  
  <p>This attribute is read-only.