Operation failed. Unspecified error.

[glebur]

I'm trying to configure an InfoPath form so that it can receive data from a
web service.

The web service is in doc/lit mode and returns this response (Groupes is
basically a SOAP-ENC:Array) :

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ns1="urn:cms">
<SOAP-ENV:Body>
<ns1:Groupes>
<item><id_groupe>1</id_groupe><nom>totu</nom></item>
<item><id_groupe>2</id_groupe><nom>groupe1</nom></item>
</ns1:Groupes>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

The SOAP response seems perfectly well-formed.

In InfoPath, when I try to add a data connexion to the Web Service, I get a
list of the operations available from this web service, but when I click on
one of the operations and then "Next>", I have an error message : "InfoPath
has detected an error. The operation has failed. Unspecified error".

So I can't reach the step where you can bind the results of the web service
operation to the elements of your InfoPath form.

I'd be glad to have your comments about this, since the error message is not
explicit at all and won't get me far.
I'm running InfoPath 11.6 SP1 on Windows XP.

Thanks in advance...