code: public com.google.api.ads.admanager.axis.v201811.Targeting getProductBuiltInTargeting() {
          return productBuiltInTargeting;
      }
docs: Gets the productBuiltInTargeting value for this ProposalLineItemConstraints.
  
  @return productBuiltInTargeting   * Built-in targeting for the created {@link ProposalLineItem}.
  
  <p>This attribute is read-only.