message listOrgModelVersionsRequest
parts 
parameters
element om:listOrgModelVersions
used by 
Operation listOrgModelVersions in PortType OrgModelService
source  
<wsdl:message name="listOrgModelVersionsRequest">
  <wsdl:part name="parameters" element="om:listOrgModelVersions"/>
</wsdl:message>

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