While writing my thesis I found a problem of the nomencl package in conjunction with the KOMA-Script classes: the header is not changed from the one which is used in the section before the nomenclature section. A simple change of \thenomenclature works. Just add the following into the preamble:

\makeatletter
\def\thenomenclature{%
  \@ifundefined{addsec}%
  {
    \@ifundefined{chapter}%
    {
      \section*{\nomname}
      \if@intoc\addcontentsline{toc}{section}{\nomname}\fi%
    }%
    {
      \chapter*{\nomname}
      \if@intoc\addcontentsline{toc}{chapter}{\nomname}\fi%
    }%
  }%
  {
    \@ifundefined{addchap}%
    {
      \if@intoc\addsec{\nomname}\else\addsec*{\nomname}\fi%
    }%
    {
      \if@intoc\addchap{\nomname}\else\addchap*{\nomname}\fi%
    }%
  }%
  \nompreamble
  \list{}{%
    \labelwidth\nom@tempdim
    \leftmargin\labelwidth
    \advance\leftmargin\labelsep
    \itemsep\nomitemsep
    \let\makelabel\nomlabel}}
\makeatother 
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