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The message is about missing data for the selected books, not about missing custom columns. LC works with data to get more data. It takes data to get data. The message says that the selected books offer nothing to work with.
Be sure to run the Extract ISBN plugin for books with no ISBN. If that does not help, then download metadata ftom a source that provides ISBN without asking for it, which will require a bit of trial and error. Or try ISBNDB.
DaltonST
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