[alphane]

You misspelled "series" as "serie", can I assume you got it correct in the plugboard?

You can test your plugboard by creating a custom column of type = built from other columns (exact wording I forget, I'd check if I wasn't typing from my Kindle ) and filling in the template there.

You are right eschwartz, there was a mistake in my post. But there wasn't in my plugboard, this is the copy/paste I should have done (stupid of me not to have before) :
template = {title} {series:} destination = title
It's so simple, but anyway I did test it (copy/paste) in custom column

Sorry to have misled you. But this is not the problem.
When I open the book I saved on the disk with E-book Viewer and look for information, I can see only my calibre {title} in the title of the book : not {title} & {series}.

So the template is not wrong. Is there a way to test why it doesn't apply to the saved epub ?