disable Auto merged messages?

i wonder if is possible to disable the 'Auto merged' messages you get when you copy ebooks between libraries.
I don't want to turn off or change the automerge feature settings i'm using, just get rid of those messages.

I tried setting the option 'Disable notifications on job completion' but that one does nothing with the 'Auto merged' (i didn't expect it to work but just to be sure :-)