code: public void setBuiltInFrequencyCaps(com.google.api.ads.admanager.axis.v201902.FrequencyCap[] builtInFrequencyCaps) {
          this.builtInFrequencyCaps = builtInFrequencyCaps;
      }
docs: Sets the builtInFrequencyCaps value for this ProposalLineItemConstraints.
  
  @param builtInFrequencyCaps   * The built-in frequency caps for the created {@link ProposalLineItem}.
  
  <p>This attribute is read-only.