message unallocateWorkItemRequest
parts 
unallocateWorkItemDoc
element dto:unallocateWorkItem
used by 
Operation unallocateWorkItem in PortType WorkItemManagementService
source  
<wsdl:message name="unallocateWorkItemRequest">
  <wsdl:part name="unallocateWorkItemDoc" element="dto:unallocateWorkItem"/>
</wsdl:message>

WSDL documentation generated by XMLSpy WSDL Editor http://www.altova.com/xmlspy