Web services backward compatibility - 11.1.1.6.0 - 10.1.3.4.0

Hi,

we currently use the web service API of BI Publisher 10.1.3.4.0 to schedule reports. Our Soap request looks like this - WSDL used: http://<server>:9704/xmlpserver/services/PublicReportService?wsdl

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:pub="http://xmlns.oracle.com/oxp/service/PublicReportService">
<soapenv:Header/>
<soapenv:Body>
<pub:scheduleReport xmlns:pub = "http://xmlns.oracle.com/oxp/service/PublicReportService">
<pub:scheduleRequest>
<pub:deliveryRequest>
<pub:emailOption>
<pub:emailBody>
...

We now have a new installation of BI Publisher 11.1.1.6.0 and migrated our existing reports. In the documentation it is mentioned that due to backward compatibility the services WSDL 

http://