We are trying to call a web service and pass as parameter some complex
types. When invoking the web service everything works well on flex
side, but on the server side the input parameters we get from flex are
not correct - complex type is removed and the elements of the complex
type are sent. See the example:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:WebService id="ws_id" wsdl="link" useProxy="false"
fault="wsFault(event)">
<mx:operation id="op_id" name="op" result="wsResult(event)">
<mx:request>
<parameters>
<parameter1>{value1}</parameter1>
<parameter2>{value2}</parameter2>
<parameter3>{value3}</parameter3>
<parameter4>
<parameter4_1>{value4_1}</parameter4_1>
<parameter4_2>{value4_2}</parameter4_2>
<parameter4_3>{value4_3}</parameter4_3>
</parameter4>
</parameters>
</mx:request>
</mx:operation>
</mx:WebService>
</mx:Application>


on server side we get this:

<parameters>
<parameter1>{value1}</parameter1>
<parameter2>{value2}</parameter2>
<parameter3>{value3}</parameter3>
<parameter4_1>{value4_1}</parameter4_1>
<parameter4_2>{value4_2}</parameter4_2>
<parameter4_3>{value4_3}</parameter4_3>
</parameters>

Instead of :

<parameters>
<parameter1>{value1}</parameter1>
<parameter2>{value2}</parameter2>
<parameter3>{value3}</parameter3>
<parameter4>
<parameter4_1>{value4_1}</parameter4_1>
<parameter4_2>{value4_2}</parameter4_2>
<parameter4_3>{value4_3}</parameter4_3>
</parameter4>
</parameters>

Any idea how is it possible to send complex type as web service input
from flex ?