Zitat
Why don't you try delete the contents of /etc/monit/conf.d/ then run omv-mkconf monit again
YEEEEEEE-HAAAAWWWWWWWWW - it works!!!!! Thanks al lot!
The answer to your question: I didn't try that, because OMV is new for me an I'm not familiar with the OMV configuration an the mkconf scripts 
Thanks @all