[NAV2009 R2] - WebService communication from NAV to NAV

Hi,

I need a WebService communication between two NAV 2009 databases (from NAV_Src to NAV_Dest).

On NAV_Dest I published a Codeunit with a function "CreateUpdateGLAccount" which should create or update a GL Account from given parameters and return some simple status text. I need to call this webservice from another database NAV_Src. Here is my code on NAV_Src:

  IF ISCLEAR(XmlHttp) THEN
    CREATE(XmlHttp, TRUE,TRUE);
  IF ISCLEAR(XmlDoc) THEN
    CREATE(XmlDoc);
  XmlDoc.async(FALSE);

  // call webservice CreateUpdateGLAccount
  url := 'http://server:7047/NAV_Dest/WS/companyName/Codeunit/IntegrationService';
  XmlHttp.open('POST', url, FALSE);
  XmlHttp.setRequestHeader('Content-Type', 'text/xml; charset=utf-8');
  soap :=
      '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" '+
      ' xmlns:nav="urn:microsoft-dynamics-schemas/codeunit/IntegrationService"> '+
          '<soapenv:Body> '+
              '<nav:CreateUpdateGLAccount> '+                 
                  '<nav:no>'+GLAccount."No."+'</nav:no> '+
                  '<nav:name>'+GLAccount.Name+'</nav:name> '+
              '</nav:CreateUpdateGLAccount> '+
          '</soapenv:Body> '+
      '</soapenv:Envelope>';
    XmlHttp.send(soap);
    IF XmlHttp.status <> 200 THEN
      ERROR('Http error '
            + FORMAT(XmlHttp.status)+': '+XmlHttp.statusText + ' ' +XmlHttp.responseText);
    XmlDoc.load(XmlHttp.responseXML);
    MESSAGE(_url+'\\'+_soap+'\\'+XmlHttp.statusText+'\\'+XmlDoc.text);

NAV_Dest

CreateUpdateGLAccount(No : Code[20];Name : Text[30])
GLAccount.RESET;
GLAccount.INIT;
GLAccount.VALIDATE("No.", No);
GLAccount.VALIDATE(Name, Name);

IF NOT _GLAccount.INSERT(TRUE) THEN BEGIN
  GLAccount.MODIFY(TRUE);
  EXIT('updated');
END ELSE
  EXIT('inserted');

I get no error and a correct status 200 but it looks like the CreateUpdateGLAccount function on NAV_Src is not called (does nothing). When I call CreateUpdateGLAccount on NAV_Dest from a simple C# application everything works fine. I tested it with Fiddler - both requests from NAV and from C# are genereting same Soap Envelope. For the C# request I get a correct response with message "update"/"inserted", but for the request from NAV_Src the response in Fiddler contains just the the wsdl xml metadata

What am I missing? Is this something related to authentication? Both databases run on same server and are in the same domain.

I tried to add SOAPAction to the request Header

XmlHttp.setRequestHeader('SOAPAction', 'CreateUpdateGLAccount2');

but then I get an error "SOAP message is invalid!'.