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Thanks for yout thoughts.
Meantime I got another idea and had success:
I recognized that the metadata within calibre are held in a separate file. It seems that changes of the metadata will not be stored in the epub but "only" in this meta-file. So I tried to convert the origin epub into the same format epub. Doing that, Calibre copies the origin and creates a new "converted" epub which contains now the changed metadata obvisously because: When I transmit this new epub to the reader the right title will be shown there.
Itīs keeps foggy for me why the sub title was shown before, because it was not visible in meta data, but you musīnt understand the whole world...
Now afer converting the affected files this way, all titles will be shown correctly.
Thanks and by.
Peter
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