<xs:element name="ClientTxnId" type="clientIdType" minOccurs="0" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:annotation>
    <xs:documentation>
      <p xmlns="http://Hps.Exchange.PosGateway">Client generated transaction identifier sent in the request of the original transaction. This indicates the transaction to be updated.</p>
      <p xmlns="http://Hps.Exchange.PosGateway" />
      <p xmlns="http://Hps.Exchange.PosGateway">
        <strong>Note:</strong> Client generated ids are critical for situations when the client never receives a response from the gateway.
            </p>
    </xs:documentation>
  </xs:annotation>
</xs:element>