Archival: Sorting of signatures

Hi,

I have problems using entry type archival. The sorting of signatures doesn't work as expexted. Jurabib seems to treat them as letters but not as numbers. Therefore, the output of the index looks like

1
11
2

instead of

1
2
11

as it should to. To illustrate the problem, have a look at the example added at the end of this message.

May anybody tell me how to fix this problem?

Thanks a lot!

Jan

%%%%% test.tex %%%%%%
\documentclass{scrbook}
\usepackage{jurabib}
\begin{document}


\cite{test1}
\cite{test2}
\cite{test3}

\bibliography{test} 
\bibliographystyle{jurabib} 
\end{document}


%%%%% test.bib %%%%%
@archival{test1,
	Archive = {Archive},
	Shortarchive = {Shortarchive},
	Sig1 = {1},
	Title = {Test1}}
	
@archival{test2,
	Archive = {Archive},
	Shortarchive = {Shortarchive},
	Sig1 = {11},
	Title = {Test2}}
	
@archival{test3,
	Archive = {Archive},
	Shortarchive = {Shortarchive},
	Sig1 = {2},
	Title = {Test3}}
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