title: How to make multiple formula lines work in org-mode tables
body: <p>I have an org-mode document with a table and several formulas. For better readability I'd like to have one line per formula. According to org-mode documentation this should be possible. However, the example "using multiple #+TBLFM" lines from this site 
  <a href="http://orgmode.org/manual/Editing-and-debugging-formulas.html" rel="nofollow">http://orgmode.org/manual/Editing-and-debugging-formulas.html</a>
  doesn't work for me. When I C-c C-c on the second formula line of the example table (see below) nothing happens. </p>
  
  <pre><code>| x | y |
  |---+---|
  | 1 | 1 |
  | 2 | 2 |
  #+TBLFM: $2=$1*1
  #+TBLFM: $2=$1*2
  </code></pre>
  
  <p>Can anybody point me to a solution (other than having the formulas in one line separated by double colons)? I'm using Emacs 24.3.1 on Ubuntu 12.04 LTS.</p>