According to the biblatex manual, the option sortcites = true makes sure that "citations are sorted according to the global sorting order of the bibliography" (§3.1.2.1). This is, however, not what I get (using the latest version of biblatex). As can be seen below, the order in the text citations is the opposite of the bibliography. How can I fix this?
\documentclass{article}
\usepackage{filecontents}
\usepackage[style=authoryear-comp,sortcites=true]{biblatex}
\begin{filecontents}{\jobname.bib}
@book{lennon1972a,
AUTHOR = "John Lennon",
TITLE = "Who did what in the Beatles",
YEAR = "1972"}
@book{lennon1972b,
AUTHOR = "John Lennon",
TITLE = "This is why I was the best musician in the Beatles",
YEAR = "1972"}
\end{filecontents}
\addbibresource{\jobname.bib}
\begin{document}
\cites{lennon1972a}{lennon1972b}
\printbibliography
\end{document}

\cite{lennon1972a,lennon1972b}. BTW:authoryear-compsetssortcites=trueautomatically. – karlkoeller Feb 03 '14 at 18:00\cites{foo}{bar}; but I think\cite{foo,bar}and\cites{foo}{bar}are handled significantly differently bybiblatex(the documentation states that the latter is built on top of the former). That said,\cite{lennon1972a,lennon1972b}does work here as well. – moewe Feb 03 '14 at 18:05\citewon't allow things like multiple page references. For that reason, I always use\cites,\parencitesetc. for multiple citations. – Sverre Feb 03 '14 at 18:05\autociteand\autocites. I always use\autocitesfor similar reasons andsortcitesonly works with\autocite. If this is intended, I think the documentation is buggy because the description on page 45 clearly says 'if multiple entry keys are passed to a citation command' which certainly implies any citation command. I thought I'd found somewhere in the manual where it did specify this behaviour but now I can't find it. – cfr Feb 04 '14 at 01:12