[OS X TeX] Working right with subequations

[Christian Burk]

Hallo,

I would like to use the subequations feature of amsmath.

I have an equation environment with \label{eq:1} and this equation is  
numbered with 0.1.
Afterwards I have the subequations environment consisting of two  
equations with \label{eq:1A} and \label{eq:1B}, but these two  
equations are numbered 0.2a and 0.2b.

How could I achieve that the equations with the label 1A and 1B get  
the number 0.1a and 0.1b?

Here is a picture of te status quo..
http://img211.imageshack.us/img211/7109/bild1rh9.png

and here my example...

------------
\documentclass[a4paper,12pt,chapterprefix,abstracton]{scrreprt}
\usepackage{amsmath}

\begin{document}

\begin{equation} \label{eq:1}
\underline{M} \ \underline{\ddot{u}} + \underline{C} \ \underline{\dot 
{u}} + \underline{S} \ \underline{u} = \underline{f}
\end{equation}

\begin{subequations}
   \begin{align}
     u &= \left(\begin{array}{c}u_1 \\ \vdots \\ u_k \\ \vdots \\ u_N 
\end{array}\right) \label{eq:1A} \\
     u &= \left(\begin{array}{c}u_2 \\ \vdots \\ u_k \\ \vdots \\ u_N 
\end{array}\right) \label{eq:1B}
   \end{align}
\end{subequations}

\end{document}

------------


Thanks in advance
Christian

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