Here is the updated BOB input names. Sorry for the confusion I just copied the part setup from the manual. But they were actually not relevant.
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What's wrong with connecting the buzzer in series ? If you explain to me the role of the override switch and how it works then i'll probably be able to understand what is not right in my diagram :(
Here is the QElectrotech file, if that can be of any help :)
wiring-diagram.qet.zip