step (MsgSteps)

b2bOpticInfo → header → timeStamps

values	description
CREATE	create of xml
TRANSFER	xml transfered to another system
RECEIPT	xml received

<xs:simpleType name="MsgSteps">
  <xs:restriction base="xs:string">
    <xs:enumeration value="CREATE"/>
    <xs:enumeration value="TRANSFER"/>
    <xs:enumeration value="RECEIPT"/>
  </xs:restriction>
</xs:simpleType>