Quote:
Originally Posted by theducks
ISBN are NOT serial numbers. They have no weight (except for the same publisher)
ISBN (10)
Language digit - Publisher 1-7 digits - Book number 7-1 digits -check digit (mod 11)
The (early) BPH's have 1 and 2 digit publisher numbers and lots of book numbers.
When a book changes Publishers, the publisher number changes as well as the book number (that could also just change with edition change)
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I so sorry for not explain me earlier. When I load a book in calibre I change the field ISBN for special field version, relation with, erratas, new translation, etc... I'd like to automatically delete books with the same title and author, but ISBN (aka version) old, for example book ZZZ version 1.1 is older than ZZZ version 1.2.
Regards
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