Problem with German Umlaut in a Web Service wsdl

Finally I found a way to get this working with some manual actions.

1. First of all change the "text file encoding" in the property settings of the ivy project to UTF-8
2. Change manually the Umlaut characters in the wsdl. i.e. Save the wsdl into a file and search/replace the Umlauts.
3. Using the modified wsdl, it should be possible to generate the web service configuration. As a result you will find a wsClient_nnnnnn.jar and wsClient_nnnnnn.wsdl file in the lib_ws/client folder in the project.
4. Generate the web service configuration a second time using the original wsdl. The compile error will still occur, but in the user home directory (e.g. C:\Users\XYZ\AppData\Local\Temp) you will found a folder tempnnnnnn with the generated java code that includes the Umlaut characters.
5. Copy/paste the content of the tempnnnnnn folder into the /src_ws folder of your ivy project and delete the wsClient_nnnnnn.jar in the lib_ws/client folder. And as last step remove the wsClient_nnnnnn.jar from the Java Build Path of the project.