Ah! Yeah, the problem is clearer.
Now seeing this... I thought at first that there was maybe a book with two ISBNs, but I've tried that and the second is automatically removed (Well actually the second in the identifiers list had priority and the first is removed).
Strange...
EDIT: Try to install the Quality Check addon; the "Check metadata/CheckISBN" option can maybe track the error.
Last edited by aleyx; 12-13-2013 at 01:09 PM.
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