code: public void setCustomFieldValues(com.google.api.ads.admanager.axis.v201902.BaseCustomFieldValue[] customFieldValues) {
          this.customFieldValues = customFieldValues;
      }
docs: Sets the customFieldValues value for this ProposalLineItem.
  
  @param customFieldValues   * The values of the custom fields associated with the {@code
  ProposalLineItem}.
  This attribute is optional.
  This attribute can be configured as editable after
  the proposal has been submitted.
  Please check with your network administrator for editable
  fields configuration.