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Thank you davidfor and chaley for you help and support!
@ davidfor: I did not manually remove the entry, instead I followed chaley's suggestion. But I believe it would have worked, see below.
@ chaley: I followed you idea and 1) used the plugin "Modify epub" to remove the calibre metadata (boxes ticked: "remove all metadata jacket"+ "remove non dc: metadata elements") and 2) used "Polish books" to replace the metadata. As a result each book came up with new metadata and NO reference to the problematic entry "pub_series".
I just finished sending the books to the Pocketbook Touch HD 3 and they were all fine: books belonging to a series showed the series and book belonging to no series showed no series.
(just as information, I forgot to mention it before: the PB firmware version is U632.6.0.926 which is the latest).
Again, thank you very much!
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