code: public void setBuiltInCompanionDeliveryOption(com.google.api.ads.admanager.axis.v201808.CompanionDeliveryOption builtInCompanionDeliveryOption) {
          this.builtInCompanionDeliveryOption = builtInCompanionDeliveryOption;
      }
docs: Sets the builtInCompanionDeliveryOption value for this ProposalLineItemConstraints.
  
  @param builtInCompanionDeliveryOption   * The built-in companion delivery option for the created {@link
  ProposalLineItem}.
  
  <p>This attribute is read-only.