Sorry, another example. I'm trying to make 2.1.0 work, and correcting in BiBTeX, so I continually encounter issues. Say you have two bibtex files X.bib and Y.bib. Some documents use X.bib, some use Y.bib. Now you make a new document that uses both X.bib and Y.bib, but they have some entries repeated. It will not compile. You could delete those entries from X.bib or Y.bib, but then files that rely on only X.bib or Y.bib will no longer compile.
I feel there needs to be at least a preference to disable checking bibtex errors, although this has been rejected in previous emails. This is really needed to collaborate with people who use only LaTeX.