I would like to give my own numbers to several chapters. I made this:

\setuphead[chapter]

    [ownnumber=yes]

        

\starttext

    \part{Erster Teil}

    \chapter{3}{Anfang}

    \chapter{6}{Weiter}

\stoptext

But the result is not the dired one. I want to have:

3 Anfang

6 Weiter

But I get

1.3 Anfang

1.6 Weiter

How can I suppress the part number? I searched for two hours or more in the Manual und on the web page and couldn’t find a hint…