code: public void setProductBuiltInTargeting(com.google.api.ads.admanager.axis.v201805.Targeting productBuiltInTargeting) {
          this.productBuiltInTargeting = productBuiltInTargeting;
      }
docs: Sets the productBuiltInTargeting value for this ProposalLineItemConstraints.
  
  @param productBuiltInTargeting   * Built-in targeting for the created {@link ProposalLineItem}.
  
  <p>This attribute is read-only.