You have started an export with Rechnungsdatenservice 1.0. The export of one or more documents fails with the error 'Invalid file format'.
One or more documents were uploaded in a file format that is not supported by DATEV.
Allowed file formats: BMP, GIF, JPEG, JPG, PNG, TIF, TIFF.
Other files: CSV, DOC, DOCX, DTA, MSG, ODS, ODT, PDF, PK7, PKCS7, RTF, TXT, XLS, XLSX, XML
Which is odd, since we actually only allow PDF files in Candis. So how could you upload something that is not a PDF? 🤔 We'll take a look at that.
Download the affected document once and save it as a PDF.
You can delete the faulty document now.
Then upload the PDF document and send it again for approval.
Click here for the official DATEV documentation for error #DCO01015 (in German).