Execute the following request in SOAP UI, using credentials and values appropriate to your environment:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsdl="http://tews6/wsdl">
<soapenv:Header/>
<soapenv:Body>
<wsdl:TaskContext>
<admin_id>imadmin</admin_id>
<admin_password>password</admin_password>
</wsdl:TaskContext>
<wsdl:ManageAccessRequestMembership>
<wsdl:ManageAccessRequestMembershipSearch>
<wsdl:Filter index="0">
<wsdl:Field>%FRIENDLY_NAME%</wsdl:Field>
<wsdl:Op>EQUALS</wsdl:Op>
<wsdl:Value>TestService01</wsdl:Value>
</wsdl:Filter>
</wsdl:ManageAccessRequestMembershipSearch>
<wsdl:ManageAccessRequestMembershipUserServiceTab>
<wsdl:ObjectList>
<wsdl:add index="0">
<wsdl:FriendlyName>pxtest01</wsdl:FriendlyName>
</wsdl:add>
</wsdl:ObjectList>
</wsdl:ManageAccessRequestMembershipUserServiceTab>
</wsdl:ManageAccessRequestMembership>
</soapenv:Body>
</soapenv:Envelope>