Note from the trace output of the script what you are sending as the SOAP body:

<SOAP-ENV:Body>
    <namesp1:ReceiveMessage xmlns:namesp1="urn:oracle:ReceiveMessage">
     <c-gensym3 xsi:type="xsd:string">SOAP::Data=HASH(0x20fad58)</c-ge
+nsym3>
   </namesp1:ReceiveMessage>
</SOAP-ENV:Body>
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I guess that you were actually intending to sending the contents of $xml rather than the stringified SOAP::Data object in $data. Of course without knowing the precise document you are supposed to be sending it's difficult to say more.

/J\