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