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<soapenv:Envelope
    xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
...
..................content of xml file...................
   </soapenv:Body>
</soapenv:Envelope>

use SOAP::Lite +trace => "all";

...
    -> proxy ($ep)
    -> call ($method => SOAP::Data->type('xml' => $aanvraag))
    ;

<soap:Envelope 
    xmlns:wkpb-stuf="http://www.vrom.nl/wkpb/stuf" 
...
    </wkpb-stuf:c-gensym2>
  </soap:Body>
</soap:Envelope>