[O] relative row reference in table formula

[OSiUX]

is possible to define the reference to the last row of the following @II+$3, to 
avoid
having to change the number of row (@4$3)?

in this example does not calculate:

  | date             | item          |    cost |
  |------------------+---------------+---------|
  | [2012-03-01 jue] | item 1        |   30.00 |
  | [2012-03-01 jue] | item 2        |   20.00 |
  |------------------+---------------+---------|
  |                  |               |   30.00 |
  #+TBLFM: @II+$3=vsum(@address@hidden);%0.2f

thanks!

--

::

  Osiris Alejandro Gomez (OSiUX) address@hidden
  AA70 93FD B6EF EB42 6920 7530 A799 B226 74C8 A3FE
  http://osiux.com http://wiki.buenosaireslibre.org

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