What

There is a filter under Editor > Research outputs, where you can find ISBN duplicates:

How

• It will look at the fields called ISBN (print) or ISBN (electronic) found under Publisher on a Research output:
  
• If you have the same ISBN on as print on one Research output and as electronic on another Research output, then it will also find them as duplicates.
• The duplicate ISBN filter will only look at the type of Research output called Book/report.
• Duplicates are not looked for in other types as for example Chapter in Book/Report/Conference proceeding.
  • This is because it is expected that multiple chapters in a book may have the same ISBN, whereas a Book/report is not expected to have the same ISBN in print and electronic.