warning about multiply-defined labels

Dear texpower-users,

compiling the following minimal example
----------------------------------------------------------
\documentclass{seminar}
\usepackage[display]{texpower}

\begin{document}
\begin{slide}

\liststepwise{
\begin{enumerate}
  \item \label{foo} \step{bar}
\end{enumerate}
}

\ref{foo}

\end{slide}
\end{document}
---------------------------------------------------------
I got a warning message about a multiply-defined label `foo'.
After removing the "\begin{slide}" and "\end{slide}" the warning
disappeared. But I hope, there are better solutions to avoid this
confusing warning.

  Ben




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