code: public function setMarketplaceIdList($value)
      {
          $marketplaceIdList = new MarketplaceWebService_Model_IdList();
          $marketplaceIdList->setId($value['Id']);
          $this->fields['MarketplaceIdList']['FieldValue'] = $marketplaceIdList;
          return;
      }
docs: Sets the value of the MarketplaceIdList.
  
  @param MarketplaceWebService_Model_IdList $value MarketplaceIdList
  @return void