3.1.4.1 SOAP Header Processing
A client MUST include the IdentityManagementOperation element (section 2.2.3.6) as a SOAP header in any WS-Transfer Get, Put, or Create request that uses the IMDA protocol extensions. The client SHOULD set the SOAP mustUnderstand attribute to true on this element.
When the server receives a WS-Transfer request on which the IdentityManagementOperation element is present as a SOAP header, one of two things MUST happen: either the server MUST process the request in accord with the IMDA extensions as described in this document, or the server MUST reject the request entirely. If the server receives a WS-Transfer request that does not contain the IdentityManagementOperation element as a SOAP header, the server SHOULD<13> treat the request as an ordinary WS-Transfer request that does not make use of the IMDA extensions.