When I run your code I get an envelope which looks on balance to okay: 

<?xml version="1.0" encoding="UTF-8"?>
<Envelope
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:namesp2="http://namespaces.soaplite.com/perl"
    soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
    xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Body>
    <changeDeliveryState xmlns="http://my_serv/services/DeliveryWS?wsd
+l">
      <c-gensym3>
        <namesp1:Context xmlns:namesp1="http://my_serv/services/Delive
+ryWS?wsdl" xsi:type="namesp2">
          <agent xsi:type="xsd:int">1</agent>
 
          <user xsi:type="xsd:string">jbbec</user>
        </namesp1:Context>
      </c-gensym3>
 
      <c-gensym8 xsi:type="xsd:int">526101</c-gensym8>
 
      <c-gensym10 xsi:type="xsd:int">2</c-gensym10>
    </changeDeliveryState>
  </Body>
</Envelope>

[download]
Although the extra <c-gensym3 /> element seems to be erroneous and can be removed by changing the \SOAP::Data->value($request_obj->as_soap_data) to simply $request_obj->as_soap_data. The missing namespace prefix on the SOAP envelope would appear to be a bug in SOAP::Lite and can be fixed by omitting the setting of the soapversion().

However I suspect that your actual error might be coming from elsewhere, could you post the output you get when you use: 

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

[download]
So we can see what XML is actually being generated and returned.

/J\

In reply to Re^3: using a client SOAP with SOAP::Lite with ComplexType by gellyfish
in thread using a client SOAP with SOAP::Lite with ComplexType by jeanba

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