protected function trailer()
{
$this->iniciaTrailer();
$this->add(1, 1, '9');
$this->add(2, 7, Util::formatCnab('9', $this->getCount(), 6));
$this->add(8, 20, Util::formatCnab('9', $this->total, 13, 2));
$this->add(21, 394, Util::formatCnab('9', 0, 374));
$this->add(395, 400, Util::formatCnab('9', $this->getCount(), 6));
return $this;
}