Dear Pablo,

Here is my example:

\setuppapersize[A4]

\setupbodyfont[termes, 12.50pt]

\setuplayout[backspace=2.9cm,

             width=fit]

\ininnermargin{\blackrule[color=black, height=0.10ex, width=1cm]\\{3.2.2}} \dontleavehmode \blackrule[color=black, height=0.10ex, width=13.50cm]

\showframe

\starttext

Me\par

\blackrule[color=black, height=0.10ex, width=13.50cm]\dontleavehmode \inoutermargin{\blackrule[color=black, height=0.10ex, width=1cm]\\{3.2.2}} \par

Me

Many thanks for your help.

Uschi Hermann