label and ref in enumerate env. don't work

 Hello,
  I'm unable to use \label and \ref in enumerate environments.
  I'd like to make a slide which contains something like:

  \begin{enumerate}
   \item \label{i1} processing 1
   \item \label{i2} processing 2
   \item \label{i3} end action after \ref{i1} and \ref{i2} completion.
  \end{enumerate}

  But when compiling, Latex give me a warning about undefined i1, i2 and
  i3 references (Yes, I've compiled several times)..

  This example used to work in other document class...

  Any idea ?

  -mathieu

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Mathieu CLABAUT                            mailto:[email protected]
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