code: public void setMarketplaceInfo(com.google.api.ads.admanager.axis.v201902.ProposalLineItemMarketplaceInfo marketplaceInfo) {
          this.marketplaceInfo = marketplaceInfo;
      }
docs: Sets the marketplaceInfo value for this ProposalLineItem.
  
  @param marketplaceInfo   * The marketplace info if this proposal line item is programmatic,
  null otherwise.
  <span class="constraint Applicable">This attribute
  is applicable when:<ul><li>using programmatic guaranteed, using sales
  management.</li><li>using programmatic guaranteed, not using sales
  management.</li></ul></span>
  <span class="constraint Required">This attribute is
  required when:<ul><li>using programmatic guaranteed, using sales management.</li><li>using
  programmatic guaranteed, not using sales management.</li></ul></span>