/**
  * @see parent::check()
  */
 function check()
 {
     if ($msg = $this->checkFormula(false)) {
         return $msg;
     }
     // verification des coordonnées
     /*$where = array(
         $this->_spec->key => "!= '$this->_id'",
         "coord_field_x" => "NOT BETWEEN coord_field_x AND coord_field_x + coord_field_colspan",
         "coord_field_y" => "NOT BETWEEN coord_field_y AND coord_field_y + coord_field_rowspan",
       );*/
     $this->formulaToDB(true);
     return parent::check();
 }