<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:cs-ors.informatica.mdm">
   <soapenv:Header>
   <Security xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
    <UsernameToken>
      <Username>admin</Username>
      <Password>admin</Password>
    </UsernameToken>
  </Security>
  </soapenv:Header>
   <soapenv:Body>
      <urn:listAssignableUsers>
         <!--Optional:-->
         <urn:parameters>
            <!--Optional:-->
            <urn:taskType>Update</urn:taskType>
            <!--Optional:-->
            <urn:businessEntity>Person</urn:businessEntity>
         </urn:parameters>
      </urn:listAssignableUsers>
   </soapenv:Body>
</soapenv:Envelope>

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <soapenv:Body>
      <ns6:listAssignableUsersReturn xmlns:ns1="urn:cs-base.informatica.mdm" xmlns:ns2="urn:co-base.informatica.mdm" xmlns:ns3="urn:co-ors.informatica.mdm" xmlns:ns4="urn:co-meta.informatica.mdm" xmlns:ns5="urn:task-base.informatica.mdm" xmlns:ns6="urn:cs-ors.informatica.mdm">
         <ns6:object>
            <ns1:users>
    									<user>
        								<userName>admin</userName>
    									</user>
													</users>
            <ns1:roles/>
         </ns6:object>
      </ns6:listAssignableUsersReturn>
   </soapenv:Body>
</soapenv:Envelope>