\documentclass[a4paper]{article}
% generated by Docutils <http://docutils.sourceforge.net/>
\usepackage{fixltx2e} % LaTeX patches, \textsubscript
\usepackage{cmap} % fix search and cut-and-paste in Acrobat
\usepackage{ifthen}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{multirow}
\setcounter{secnumdepth}{0}
\usepackage{longtable,ltcaption,array}
\setlength{\extrarowheight}{2pt}
\newlength{\DUtablewidth} % internal use in tables

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%%% Body
\begin{document}

Multirows dont work.


\section{Attention%
  \label{attention}%
}
%
\begin{itemize}

\item cell spanning in multirow table is missing !

\item blank lines in multirows are not alloed

\end{itemize}

\setlength{\DUtablewidth}{\linewidth}
\begin{longtable}[c]{|p{0.086\DUtablewidth}|p{0.098\DUtablewidth}|}
\caption{row on left side}\\
\hline
\multirow{2}{0.09\DUtablewidth}{%
left
span
} & 
right
 \\
\cline{2-2}
 & 
single
 \\
\hline

belo
 & 
b too
 \\
\hline
\end{longtable}

\setlength{\DUtablewidth}{\linewidth}
\begin{longtable}[c]{|p{0.086\DUtablewidth}|p{0.086\DUtablewidth}|}
\caption{row on right side}\\
\hline

abov
 & 
e
 \\
\hline

left
 & \multirow{2}{0.09\DUtablewidth}{%
right
right
right
} \\
\cline{1-1}

left
 &  \\
\hline
\end{longtable}

\setlength{\DUtablewidth}{\linewidth}
\begin{longtable}[c]{|p{0.086\DUtablewidth}|p{0.086\DUtablewidth}|p{0.086\DUtablewidth}|}
\caption{row in the midle}\\
\hline

left
 & \multirow{2}{0.09\DUtablewidth}{%
mid
mid
mid
} & 
right
 \\
\cline{1-1}
\cline{3-3}

left
 &  & 
right
 \\
\hline
\end{longtable}

\setlength{\DUtablewidth}{\linewidth}
\begin{longtable}[c]{|p{0.086\DUtablewidth}|p{0.086\DUtablewidth}|p{0.098\DUtablewidth}|}
\caption{row left and right}\\
\hline
\multirow{2}{0.09\DUtablewidth}{%
left
left
} & 
mid
 & \multirow{2}{0.10\DUtablewidth}{%
right
2
right
} \\
\cline{2-2}
 & 
mid
 &  \\
\hline
\end{longtable}

\setlength{\DUtablewidth}{\linewidth}
\begin{longtable}[c]{|p{0.086\DUtablewidth}|p{0.051\DUtablewidth}|p{0.098\DUtablewidth}|}
\caption{row on left side}\\
\hline
\multirow{4}{0.09\DUtablewidth}{%
left
span
} & \multirow{2}{0.05\DUtablewidth}{%
1
} & 
right
 \\
\cline{3-3}
 &  & 
secnd
 \\
\cline{2-2}
\cline{3-3}
 & \multirow{2}{0.05\DUtablewidth}{%} & 
3rd
 \\
\cline{3-3}
 &  & 
single
 \\
\hline

belo
 & 
3
 & 
b too
 \\
\hline
\end{longtable}

\end{document}