Oracle Service Bus, set filename for business service

And ex-colleague asked me to give a little help on setting the filename which was getting created by his Oracle Service Bus flow. Create a new business service with file transport and set the correct location of the file with his prefixes. In this wizard we can only set the prefixes and the location of the file, so no option to set the filename by use of some expression. For the interface of the proxy service i used the almighty helloworld wsdl, and the content of this request we...