Thank you davidfor, I have indeed a user-defined column called "#pub_series". Going along with your idea of renaming it I changed it to "#pub_order". So far so good. I restarted calibre, did a format on the internal memory of the pocketbook and hoped for the best.
Annoyingly the problem does still exist and the error is the same. So I checked everything and found no reference to pub_series. With one exception: There is something called "content.opf" in the ebook file (under "Miscallaneous"). And this file contains
<meta name="calibre:user_metadata:#pub_series"
even though "#pub_series" has been renamed to "#pub_order".
I think the renaming did only changed the name shown in the GUI but not the original user-defined column.
Is there a chance to force a renaming or is it not possible due to restrictions within the database?
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