# Overfull hbox in rule below chapter title

I am writing a report with the KOMA-Script class scrreprt. Below each chapter title, I am creating a rule which goes all the way to the end of the paper:

This actually works fine, but creates an overfull hbox warning at every chapter title:

Overfull \hbox (89.62619pt too wide) in paragraph

I am not very surprised by this warning, as I am creating a too wide box. The 89.62619pt is exactly the length between the right end of the paragraph and the end of the paper.

Is there a way to create such rules without creating overfull boxes? Or otherwise, is there a way to suppress this warning (but only for this rule in the chapter heading)?

Here is a MWE containing my redefinition of the chapter heading and a test case:

\documentclass{scrreprt}
\usepackage{calc}

\makeatletter
\hfill
\begin{minipage}[b]{9cm}
\raggedleft
\sffamily\huge\textbf{#1}
\end{minipage}
\sffamily\huge\textbf{\thechapter}
\vskip 5\p@
\noindent
\rule{\paperwidth-\oddsidemargin-\hoffset-1in}{0.7pt}
\vskip 20\p@
\normalfont\normalsize
}
\makeatother

\begin{document}
\chapter{A test chapter}
Some example text.

\chapter{Another very long chapter title which will break}
Even more text.

\end{document}


Small comment: I am creating the minipage so chapter titles which are longer than one line also work correctly. If there is a better way of doing this, I am happy about suggestions.

• you can just out \hspace{-\paperwidth} after the rule (or any length really:-) Also you are missing % from the ends of most lines in your definition. – David Carlisle Sep 30 '15 at 6:50

Here is only an additional suggestion how the chapter title could be formatted: With the new KOMA-Script Version 3.19 you can redefine \chapterlinesformat to change the layout of the chapter heading. This works also for unnumbered chapters like the table of contents.

\documentclass{scrreprt}[2015/09/29]

\RedeclareSectionCommand[
beforeskip=0pt,
afterskip=20pt,
font=\huge
]{chapter}

\renewcommand\raggedchapter{\raggedleft}
\renewcommand\chapterformat{\thechapter}

\renewcommand\chapterlinesformat[3]{%
\parbox[b]{\textwidth}{%
\raggedchapter%
\begin{minipage}[b]{9cm}
\raggedchapter #3
\end{minipage}%
\makebox[\textwidth][l]{\rule{\paperwidth}{.7pt}}%
}%
}

\begin{document}
\tableofcontents
\chapter{A test chapter}
Some example text.
\chapter{Another very long chapter title which will break}
Even more text.
\end{document}


Note that version 3.19 is already on CTAN and will be soon in TeXLive and MiKTeX. But you can also install the current version from the repository on the KOMA-Script Website.

• Thanks a lot for this suggestion. I will think about switching to \chapterlinesformat once KOMA-Script 3.19 comes with standard installations. – hbaderts Sep 30 '15 at 14:18

Your rule is extending in to the right margin and it is natural that it produces bad boxes. Put the rule inside a box of, say \textwidth to get rid of the bad box.

\documentclass{scrreprt}
\usepackage{calc}

\makeatletter
\hfill
\begin{minipage}[b]{9cm}
\raggedleft
\sffamily\huge\textbf{#1}
\end{minipage}
\sffamily\huge\textbf{\thechapter}
\vskip 5\p@
\noindent
\makebox[\textwidth][l]{\rule{\paperwidth-\oddsidemargin-\hoffset-1in}{0.7pt}}
\vskip 20\p@
\normalfont\normalsize
}
\makeatother

\begin{document}
\chapter{A test chapter}
Some example text.

\chapter{Another very long chapter title which will break}
Even more text.

\end{document}


• Nice, I didn't know one can just specify a smaller box. Thank you very much. – hbaderts Sep 30 '15 at 7:14