New listing form again, I'm afraid. If you create saved listing templates using the old form, you can set "Does not apply" for ISBN or EAN in the template. If you create with the new listing form (or edit a saved template) then "Does not apply" can be entered and appears to have saved but it throws it back out without telling you. When you go to list using the template, the field is blank.

I raised this a few weeks ago but it's still not fixed. It wastes a lot of time when listing if you have to write it out on every listing. It has to be filled in for categories where it's compulsory so I can't just leave it blank. Records before the late 80s don't have an EAN so there's nothing else to put there. As you probably know, ISBN can't be entered for audio books (although most of them have one) due to the longstanding category error in ebay's catalogue data for virtually the whole of that category.