Edge 2 Nodes verbinden: Position bei einem angeben, dann gerade Linie zeichnen?

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    \documentclass[margin=5mm]{standalone}
    \usepackage[utf8]{inputenc}
    \usepackage{tikz}
    \usetikzlibrary{matrix,positioning}
    \tikzset{
  tab/.style={inner sep=0pt,
    nodes={inner sep=.333em,
      % notwendig für leere Zellen und Unterlängen:
      minimum height={\baselineskip+0.666em}
    }
  },
  vtab/.style={matrix of nodes,tab,
    row sep=-\pgflinewidth,column sep=-\pgflinewidth,
    nodes in empty cells,% leere Zellen werden ebenfalls gezeichnet
    row 1/.style={nodes={align=center}},
    nodes={draw,align=left,text width=#1}
  },
  vtab/.default=3cm,% voreingestellte Breite
  htab/.style={matrix of nodes,draw,tab,anchor=north west},
  every edge/.append style={font=\footnotesize\strut,inner ysep=.1em},
  pfeil/.style={out=270,in=90,->}
}
    \begin{document}
    \resizebox{\textwidth}{!}{%
    \begin{itshape}
    \begin{tikzpicture}[thick,
      % vertikaler und horizontaler Abstand zwischen den Tabellen:
      node distance=1cm and 3.5cm, % row 1/.style={},
    ]
    %Tabelle
    \matrix(S)[vtab]{Stelle\\{Nummer<<pk>>}\\\\};
    \matrix(OU)[right= of S,vtab=3.5cm]{Organisationseinheit\\{Nummer<<pk>>\newline Name\newline Art}\\\\};
    \path(S)edge
          node[pos=0,above right]{zugeordnet}node[pos=0,below right]{N}
          node[pos=1,above left]{beinhaltet}node[pos=1,below left]{1}
          (OU);
    \end{tikzpicture}
    \end{itshape}
    }
    \end{document}
 
 
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