Has to be \defineheadalternative:
\defineheadalternative[mysection][renderingsetup=mysection]
\startsetups[mysection]
\vbox\bgroup
\headsetupspacing
\strut\headnumbercontent\par
\begstrut\headtextcontent\endstrut
\egroup
\stopsetups
\setuplabeltext[en][section={, Section}]
\setuphead
[section]
[alternative=mysection,
conversion=I,
sectionstopper=.]
\starttext
\section{Test}
\stoptext
Wolfgang
It works nice, thanks
Jan
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