-% ---------- Währungszeichen ----------
-\newcommand{\currency}{$(currency)$}
-\ifthenelse{\equal{\currency}{EUR}}{\let\currency\euro}{}
-\ifthenelse{\equal{\currency}{YEN}}{\let\currency\textyen}{}
-\ifthenelse{\equal{\currency}{GBP}}{\let\currency\pounds}{}
-\ifthenelse{\equal{\currency}{USD}}{\let\currency\$}{}
+% ---------- Währungszeichen ----------
+\newcommand{\currency}{\euro}
+\ifthenelse{\equal{$(currency)$}{YEN}}{\let\currency\textyen}{}
+\ifthenelse{\equal{$(currency)$}{GBP}}{\let\currency\pounds}{}
+\ifthenelse{\equal{$(currency)$}{USD}}{\let\currency\$}{}