protected function getNonBreakingErrors()
    {
        $errors = [];

        $unknownRelations = $this->unknownRelationsFromRequest();
        if (count($unknownRelations) > 0) {
            $errors[] = [
                'code' => static::ERROR_UNKNOWN_LINKED_RESOURCES,
                'title' => 'Unknown included resource requested',
                'description' => 'These included resources are not available: ' . implode(', ', $unknownRelations)
            ];
        }

        return $errors;
    }