"report or grey literature" entry type exports "file" field to BibTeX though no mapping is specified
When exporting a .bib file with an altered Biblatex export filter, the citavi field "Local file" is exported to an empty bibtex field and given a value. This is buggy behavior, as far as I see it. It only happens for the entry type "Report or gray literature", but it could also happen in entry types I have not tested. Please see attachments and don't hesitate to ask for additional information.