Part in classicthesis doesn't display capital roman numerals

Question

Very soft question, perhaps: I'm writing a document using classicthesis. I divided it in parts with the\part command. So it has "Part I", "Part II", etc. But the link to this parts, as displayed in the PDF, says instead "Part i",...,"Part iii". How can I capitalize this numeration?

\documentclass[ twoside,openright,titlepage,numbers=noenddot,headinclude,%1headlines,% letterpaper a4paper
                footinclude=true,cleardoublepage=empty,abstractoff, % <--- obsolete, remove (todo)
                BCOR=5mm,paper=a4,fontsize=11pt,%11pt,a4paper,%
                ngerman,american,%
                ]{scrreprt}

%\usepackage{classicthesis-preamble}
\input{classicthesis-config}
\begin{document}
\selectlanguage{american} 
\pagenumbering{roman}
\pagestyle{plain}
\pagenumbering{arabic}
\part{Title zero}\label{part:z}
In \autoref{part:b} we will analyze ...
\part{Title one}\label{part:a}
As in \autoref{part:a}, this part \textit{blah blah}
\part{Title two}\label{part:b} 
\part{Title three}\label{part:c} 
\end{document}

I was asked to provide classicthesis-config.tex:

\PassOptionsToPackage{eulerchapternumbers,listings,drafting,%
                 pdfspacing,%floatperchapter,%linedheaders,%
                 subfig,beramono,eulermath,parts}{classicthesis}                                        

\usepackage{ifthen}
\newboolean{enable-backrefs} % enable backrefs in the bibliography
\setboolean{enable-backrefs}{false} % true false

\newcommand{\myTitle}{A Classic Thesis Style\xspace}
\newcommand{\mySubtitle}{An Homage to The Elements of Typographic Style\xspace}
\newcommand{\myDegree}{Doktor-Ingenieur (Dr.-Ing.)\xspace}
\newcommand{\myName}{Andr\'e Miede\xspace}
\newcommand{\myProf}{Put name here\xspace}
\newcommand{\myOtherProf}{Put name here\xspace}
\newcommand{\mySupervisor}{Put name here\xspace}
\newcommand{\myFaculty}{Put data here\xspace}
\newcommand{\myDepartment}{Put data here\xspace}
\newcommand{\myUni}{Put data here\xspace}
\newcommand{\myLocation}{Darmstadt\xspace}
\newcommand{\myTime}{August 2012\xspace}
\newcommand{\myVersion}{version 4.1\xspace}

\newcounter{dummy} % necessary for correct hyperlinks (to index, bib, etc.)
\newlength{\abcd} % for ab..z string length calculation
\providecommand{\mLyX}{L\kern-.1667em\lower.25em\hbox{Y}\kern-.125emX\@}
\newcommand{\ie}{i.\,e.}
\newcommand{\Ie}{I.\,e.}
\newcommand{\eg}{e.\,g.}
\newcommand{\Eg}{E.\,g.} 
\PassOptionsToPackage{latin9}{inputenc} % latin9 (ISO-8859-9) = latin1+"Euro sign"
 \usepackage{inputenc}              

\usepackage{babel}                  

\PassOptionsToPackage{square,numbers}{natbib}
 \usepackage{natbib}                

\PassOptionsToPackage{fleqn}{amsmath}       
 \usepackage{amsmath}
\PassOptionsToPackage{T1}{fontenc} % T2A for cyrillics
    \usepackage{fontenc}     
\usepackage{textcomp} % fix warning with missing font shapes
\usepackage{scrhack} % fix warnings when using KOMA with listings package          
\usepackage{xspace} % to get the spacing after macros right  
\usepackage{mparhack} % get marginpar right
\usepackage{fixltx2e} % fixes some LaTeX stuff 
\PassOptionsToPackage{printonlyused,smaller}{acronym}
    \usepackage{acronym} % nice macros for handling all acronyms in the thesis

\renewcommand{\bflabel}[1]{{#1}\hfill} % fix the list of acronyms


\usepackage{tabularx} % better tables
    \setlength{\extrarowheight}{3pt} % increase table row height
\newcommand{\tableheadline}[1]{\multicolumn{1}{c}{\spacedlowsmallcaps{#1}}}
\newcommand{\myfloatalign}{\centering} % to be used with each float for alignment
\usepackage{caption}
\captionsetup{format=hang,font=small}
\usepackage{subfig}  

\usepackage{listings} 
%\lstset{emph={trueIndex,root},emphstyle=\color{BlueViolet}}%\underbar} % for special keywords
\lstset{language=[LaTeX]Tex,%C++,
    keywordstyle=\color{RoyalBlue},%\bfseries,
    basicstyle=\small\ttfamily,
    %identifierstyle=\color{NavyBlue},
    commentstyle=\color{Green}\ttfamily,
    stringstyle=\rmfamily,
    numbers=none,%left,%
    numberstyle=\scriptsize,%\tiny
    stepnumber=5,
    numbersep=8pt,
    showstringspaces=false,
    breaklines=true,
    frameround=ftff,
    frame=single,
    belowcaptionskip=.75\baselineskip
    %frame=L
} 

\PassOptionsToPackage{pdftex,hyperfootnotes=false,pdfpagelabels}{hyperref}
    \usepackage{hyperref}  % backref linktocpage pagebackref
\pdfcompresslevel=9
\pdfadjustspacing=1 
\PassOptionsToPackage{pdftex}{graphicx}
    \usepackage{graphicx} 
\newcommand{\backrefnotcitedstring}{\relax}%(Not cited.)
\newcommand{\backrefcitedsinglestring}[1]{(Cited on page~#1.)}
\newcommand{\backrefcitedmultistring}[1]{(Cited on pages~#1.)}
\ifthenelse{\boolean{enable-backrefs}}%
{%
        \PassOptionsToPackage{hyperpageref}{backref}
        \usepackage{backref} % to be loaded after hyperref package 
           \renewcommand{\backreftwosep}{ and~} % separate 2 pages
           \renewcommand{\backreflastsep}{, and~} % separate last of longer list
           \renewcommand*{\backref}[1]{}  % disable standard
           \renewcommand*{\backrefalt}[4]{% detailed backref
              \ifcase #1 %
                 \backrefnotcitedstring%
              \or%
                 \backrefcitedsinglestring{#2}%
              \else%
                 \backrefcitedmultistring{#2}%
              \fi}%
}{\relax}    
\hypersetup{%
    %draft, % = no hyperlinking at all (useful in b/w printouts)
    colorlinks=true, linktocpage=true, pdfstartpage=3, pdfstartview=FitV,%
    % uncomment the following line if you want to have black links (e.g., for printing)
    %colorlinks=false, linktocpage=false, pdfborder={0 0 0}, pdfstartpage=3, pdfstartview=FitV,% 
    breaklinks=true, pdfpagemode=UseNone, pageanchor=true, pdfpagemode=UseOutlines,%
    plainpages=false, bookmarksnumbered, bookmarksopen=true, bookmarksopenlevel=1,%
    hypertexnames=true, pdfhighlight=/O,%nesting=true,%frenchlinks,%
    urlcolor=webbrown, linkcolor=RoyalBlue, citecolor=webgreen, %pagecolor=RoyalBlue,%
    %urlcolor=Black, linkcolor=Black, citecolor=Black, %pagecolor=Black,%
    pdftitle={\myTitle},%
    pdfauthor={\textcopyright\ \myName, \myUni, \myFaculty},%
    pdfsubject={},%
    pdfkeywords={},%
    pdfcreator={pdfLaTeX},%
    pdfproducer={LaTeX with hyperref and classicthesis}%
}   

\makeatletter
\@ifpackageloaded{babel}%
    {%
       \addto\extrasamerican{%
                    \renewcommand*{\figureautorefname}{Figure}%
                    \renewcommand*{\tableautorefname}{Table}%
                    \renewcommand*{\partautorefname}{Part}%
                    \renewcommand*{\chapterautorefname}{Chapter}%
                    \renewcommand*{\sectionautorefname}{Section}%
                    \renewcommand*{\subsectionautorefname}{Section}%
                    \renewcommand*{\subsubsectionautorefname}{Section}%     
                }%
       \addto\extrasngerman{% 
                    \renewcommand*{\paragraphautorefname}{Absatz}%
                    \renewcommand*{\subparagraphautorefname}{Unterabsatz}%
                    \renewcommand*{\footnoteautorefname}{Fu\"snote}%
                    \renewcommand*{\FancyVerbLineautorefname}{Zeile}%
                    \renewcommand*{\theoremautorefname}{Theorem}%
                    \renewcommand*{\appendixautorefname}{Anhang}%
                    \renewcommand*{\equationautorefname}{Gleichung}%        
                    \renewcommand*{\itemautorefname}{Punkt}%
                }%  
            % Fix to getting autorefs for subfigures right (thanks to Belinda Vogt for changing the definition)
            \providecommand{\subfigureautorefname}{\figureautorefname}%             
    }{\relax}
\makeatother

\usepackage{classicthesis} 

Answer 1

The problem is that the parts option for classicthesis (the file classicthesis-config.tex passes this option to classicthesis) issues

\renewcommand{\thepart}{\roman{part}}

To override this and to be able to use uppercased Roman numerals, add to the preamble

\AtBeginDocument{\renewcommand{\thepart}{\Roman{part}}}