If you remove the space, i.e.
\starttext
\startchapter
[ title={Vorwort}, reference=chap:vorwort]
Siehe \in{Kapitel}[chap:neu] \at{Seite}[chap:neu].
\stopchapter
\startchapter
[ title={Neu}, reference=chap:neu]
Bla.
\stopchapter
\stoptext
it works here.
/Mikael
On Sat, Nov 2, 2013 at 1:49 PM, Wolfgang Werners-Lucchini wrote: Hallo, I must do someting wrong
---
\starttext
\startchapter
[ title={Vorwort}, reference=chap:vorwort ] Siehe \in{Kapitel}[chap:neu] \at{Seite}[chap:neu].
\stopchapter
\startchapter
[ title={Neu}, reference=chap:neu ] Bla.
\stopchapter
\stoptext
---
I get an error: unknown reference '[][chap:neu]' Wolfgang ___________________________________________________________________________________
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