okay I just installed a fresh version of : TESB_SE-V5.4.0-SNAPSHOT - it worked out of the box!
Strange - but I 'm happy now!
Unfortunately my Webservice Client (done in TOS-DI) - with the tWebserviceInput component doesn't seem to work with the username token of the TESB_SE. The job still fails.
Using ESB-Job with tESBConsumer works.