eq current-group()/zs_absatz[1]/

you haven't shown what the group is, but that probably needs to be 

 eq zs_absatz[1]/

as on the right hand side of the eq you want a single item (eg the
first) and then you are testing thatevery other item is equal to that.
so you could use

current-group()[1]/zs_absatz[1]/

except that current-group()[1]/ is teh same as ./ which you can always
omit.

David

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