protected function isNewVariant()
    {
        $bIsNewVariant = false;
        if (!is_null($this->sRestriction) && !is_null($this->sRestrictionField) && '_id' == substr($this->sRestrictionField, -3)) {
            if ('variant_parent_id' == $this->sRestrictionField) {
                $bIsNewVariant = true;
            }
        }

        return $bIsNewVariant;
    }