Okay, new try, first happiness and another load of confusion:
This formula
{#series_index:'re(format_number($, '07.2f'), '\.' , ',')'}
didn't work ("Error in the Original") until I took out "#"
Now the numbers look absolutely great - but only in Calibre!
Then I recognized that this is a problem of LibreOffice: When clicking on the CSV, in the preview the column looks great (0001,00 instead of 1) but as soon as I go the next step, its a simply "1" again.
So I just decided - in the preview of the csv - making this column text instead of numbers and it worked! Now open I see 0001,00 and so on and so far it looks fine. If I got further problems, I'll be back^^
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