protected function selectedButNotPartOfEntry($attribute, array $entry)
    {
        $lcAttribute = strtolower($attribute);

        $inSelectedAttributes = in_array($lcAttribute, array_map('strtolower', $this->selectedAttributes));
        $existsInEntry = array_key_exists($lcAttribute, array_change_key_case($entry));

        return ($inSelectedAttributes && !$existsInEntry);
    }