[O] exporting radio tables longtabular

[Uwe Brauer]

Hi

In  a latex file the following radio table does precisely what I want
% BEGIN RECEIVE ORGTBL this
\begin{longtabu}{|l|l|}
\hline
hallo & this\\ \hline
\end{longtabu}
% END RECEIVE ORGTBL this
\begin{comment}
#+ORGTBL: SEND this orgtbl-to-latex  :lend "\\\\ \\hline" :environment longtabu
  | / | <>    | <>   |
  |---+-------+------|
  |   | hallo | this |
\end{comment}


However when I try to work with an org file and exporting the table to a
latex file via

| / | <>                                 | <>        | <> | <> | <> | <> | <> | 
<>  |
|   | Apellido, Nombre                   | DNI       | E1 | E2 | E3 | E4 | E5 | 
Res |
|---+------------------------------------+-----------+----+----+----+----+----+-----|
|   | Brauer                             |           | 1  | 1  | 2  | 3  | 3  | 
10  |
# ATTR_LaTeX: :environment longtabu

It is not exported as a lontabu environment.

What do I miss?

Thanks

Uwe Brauer