public function offsetSet($field, $value)
    {
        $state = $this->getState();
        if ($state == self::STATE_DELETED) {
            throw new Exception\LogicException(__METHOD__ . ": Logic exception, cannot operate on record that was deleted");
        }


        $this->_securedFieldForArrayAccess['data'][$field] = $value;
        if ($state != self::STATE_NEW) {
            $this->setState(self::STATE_DIRTY);
        }
        return $this;
    }