Hi there,
it's because you're trying to place subtitles only.
Try it with main tile chapter before your section, then you'll see yourself:
\starttext
\placecontent
\startbodymatter
\section{Sec1}
In sec 1
\stopbodymatter
\startappendices
%\definestructureconversionset[T][][A]
%\setupheads[sectionconversionset=T]
\chapter{ChapB}
In chap B
\section{SecA}
In sec A
\stopappendices
\stoptext
Cheers.
Am 06/01/2018 um 14:32 schrieb Procházka Lukáš Ing.:
\starttext
\placecontent
\startbodymatter
\section{Sec1}
In sec 1
\stopbodymatter
\startappendices
\definestructureconversionset[T][][A]
\setupheads[sectionconversionset=T]
\section{SecA}
In sec A
\stopappendices
\stoptext
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