# Subsection destroys ToC in PDF

in my thesis I have an abstract, the toc and then the content. The content sections start again with 1. When I add a subsection at the content section, the toc of the PDF is destroyed and shows something like this:

Abstract
----> Inhalt
----> Einleitung
----> title


Abstract
Inhalt
Einleitung
title


This is the code I'm using:

\documentclass[12pt,a4paper,bibliography=totocnumbered,listof=totocnumbered]{scrartcl}
\usepackage[ngerman]{babel}
\usepackage{hyperref}
\begin{document}
\renewcommand{\thesection}{\Roman{section}}
\pagenumbering{Roman}
\section{Abstract}
\renewcommand{\contentsname}{II Inhaltsverzeichnis}
\tableofcontents
\renewcommand{\thesection}{\arabic{section}}
\setcounter{section}{0}
\pagenumbering{arabic}
\setcounter{page}{1}
\section{Einleitung}
% next line messes all up
\subsection{title}
\end{document}

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You shouldn't use an article class (here scrartcl) for a thesis! Use either a book or report one. –  Martin Scharrer Jun 20 '11 at 12:43

pdfTeX warning (ext4): destination with the same

Gives the section numbers of hyperref a unique representation by redefining also \theHsection when you change \thesection. E.g.
\renewcommand{\theHsection}{\Roman{section}}