Tried to change the date in https://beta.bookbrainz.org/edition/966489c8-d3c8-4bee-8e55-ff409d6ebf7d/edit from 1915 (an obvious error) to 2015.
I can't submit this change because the button is still greyed out.

A possible reason is an error with (previously excising) identifiers - this should not interfere with other changes.

Additionally the issue with the identifier appears to be the format of the ISBN - spaces should be ignored regardless. (but this is related to BB-602 + a yet-to-be-made ticket about identifiers format) ( BB-648)