Bad SOAP Response

I develop a soap server with a service name authenticate In my SOAP server constructor I declare : ... $this->dispatch_map['authenticate'] = array('in' => array('Login' => 'string','Password' => 'string'), 'out' => array('Return' => 'boolean','UserID' => 'string') ); ... I test it on my server and it works ! (php 4.2.2) The SOAP answer is : <?xml version="1.0" encoding="UTF-8" ?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns4="urn:quizbeesoapserver" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Body> <ns4:authenticateResponse> <Return xsi:type="xsd:boolean">true</Return> <UserID xsi:type="xsd:string">ghkhqkfghq</UserID> </ns4:authenticateResponse> </SOAP-ENV:Body> </SOAP-ENV:Envelope> I install it on an other server and the answer is different (php 4.3.0) <?xml version="1.0" encoding="UTF-8" ?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns4="urn:quizbeesoapserver" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Body> <ns4:authenticateResponse> <return> <Return xsi:type="xsd:boolean">true</Return> <UserID xsi:type="xsd:string">ghkhqkfghq</UserID> </return> </ns4:authenticateResponse> </SOAP-ENV:Body> </SOAP-ENV:Envelope> It adds the <return> tag and I don't understand why ? My client is unable to parse the answer !! ... if ($aResAppel["Return"]==true) is always wrong !! ... Is it because I don't use the same PHP and PEAR version ? Is it because I have to configure something somewhere ? Thnks for your help Yves