Thanks Manuela,
It is very easy to be confused with FamilySearch.
I saw a marriage listed under "Deutschland, Preußen, Brandenburg und Posen, Kirchenbuchduplikate, 1794-1874" in FamilySearch.
Germany in this example was used by FamilySearch as a guide to their category structure. It is not the same as Wikitree categories and it is very misleading while trying to find a marriage in the town Unruhstadt in the Grand Duchy of Posen in 1841.