[Tex/LaTex] Koma Script and real 13pt

fontsizekoma-scriptxetex

I read about these several questions, how to use a font size other than 10, 11 oder 12 (see e.g. this one) using KomaScript, but somehow, that won't work for me. I use XeLaTeX to compile my document (in order to change the font also, but the problem already occurs without that).

Then using the MWE

\documentclass[fontsize=13,DIV=12]{scrbook}
\usepackage[no-math]{fontspec}
\usepackage{xunicode,xltxtra} 

\begin{document}
    Dieser Text sollte in Schrift 13pt sein, ist aber 12pt
\end{document}

The warning then is

LaTeX Font Warning: Font shape `OT1/cmr/m/n' in size <13> not available

(Font) size <12> substituted on input line 1366.

Which i suspect is due to OT1 but how do I tell XeLaTeX to use T1 (also because it's a german text, as the MWE might already suggest)?

Best Answer

You can ignore the message: It is only a side effect of the calculation. The font itself is in 13pt:

Add 

 \fontsize{12pt}{12pt}\selectfont Dieser Text sollte in Schrift 13pt sein, ist aber 12pt

after your text to see the difference.

If you want to avoid the warning altogether add \RequirePackage{fix-cm} before \documentclass.

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