LaTeX Forum

\documentclass[12pt]{scrreprt} 

% input encoding Unterstützung: 
\usepackage[utf8]{inputenc} 

% Tabellen: 
\usepackage{tabu,longtable} 

% Listen: 
\makeatletter
\newcommand{\minipagetrue}{\@minipagetrue}
\makeatother

\usepackage{enumitem} 
\newlist{citemize}{itemize}{4} 
\setlist[citemize]{nosep,after=\vskip-\baselineskip,label=-,leftmargin=*,before=\minipagetrue}
\setlist[citemize,1]{label=\textbullet,before=\vspace{\dp\strutbox}}

\begin{document} 

\begin{longtabu}{|X[5,l,b] | X[r,b]|} 
\hline 
\begin{citemize} 
\item 1 
    \begin{citemize} 
    \item 1-1 
    \item 1-2 
    \item 1-3 
    \end{citemize} 
\item 2 
\end{citemize} & rechts unten sollst du sein\\ 
\hline 
\end{longtabu} 
\end{document} 

\documentclass[12pt, a4paper]{scrreprt}

% input encoding Unterstützung:
\usepackage[utf8]{inputenc}

% Tabellen:
\usepackage{tabu,longtable}

% Listen:
\usepackage{enumitem}
\newlist{citemize}{itemize}{4}
\setlist[citemize]{label=- , nosep, topsep=-\parskip} 

\begin{document}

\begin{longtabu}{|X[5,l] | X[r,b]|}
\hline
\begin{itemize}[topsep=-\parskip]
\item 1
	\begin{citemize}
	\item 1-1
	\item 1-2
	\item 1-3
	\end{citemize}
\item 2
\end{itemize} & rechts unten sollst du sein\\
\hline
\end{longtabu}
\end{document}