public function resetParent()
    {
        $sParentId = $this->oxarticles__oxparentid->value;
        $this->oxarticles__oxparentid = new \OxidEsales\Eshop\Core\Field('', \OxidEsales\Eshop\Core\Field::T_RAW);
        $this->_blAllowEmptyParentId = true;
        $this->save();
        $this->_blAllowEmptyParentId = false;

        if ($sParentId !== '') {
            $this->onChange(ACTION_UPDATE, null, $sParentId);
        }
    }