As chaley say's,
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Originally Posted by ;
"It was removed because calibre now supports an arbitrary number of different IDs. One sees DOI, ASIN, ISBN, GoodReads, and many others. "
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In my experience when you download metadata calibre lists the isbn first in the IDs field, then any other ids, such as amazon, google, etc. after. If you need to add an isbn manually use the paste button to the left of the IDs field and calibre will add the isbn: part automatically.
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Odin