DocumentReference 

<Documentation>
  <Description>Structure which contains information that links this request to a reference document, i.e., contract, agreement, etc.</Description>
</Documentation>

Element Information

Model

DocumentIdentifier , DateTime{0,1} , ReferenceItem{0,1} , ReleaseNumber{0,1}
Children: DateTime, DocumentIdentifier, ReferenceItem, ReleaseNumber

Used By

Complex Types ContractInformationType, InvoiceNumberType, LetterOfCreditInformationType, LoadTenderInformationType, MarketPlaceDocumentReferenceType, PurchaseOrderInformationType, ReconciliationNumberType, ReferenceInformationType, SalesOrderIdentifierType, ShipWithPurchaseOrderType, ShipmentIdentificationType

Source 

<xsd:element name="DocumentReference" type="DocumentReferenceType">
  <xsd:annotation>
    <xsd:documentation>
      <Documentation>
        <Description>Structure which contains information that links this request to a reference document, i.e., contract, agreement, etc.</Description>
      </Documentation>
    </xsd:documentation>
  </xsd:annotation>
</xsd:element>

Sample