---
title: "required if other fields empty · RUAL Documentation"
description: "RUAL field validation block."
canonical: https://docs.rual.nl/block-types/field validation/fieldvalidation_required_if_empty
language: en
---

# required if other fields empty

This block is part of the [`field validation`](https://docs.rual.nl/block-types/field%20validation) group and was last modified in core [`v10.4.28`](https://docs.rual.nl/core-versions/100428).

### Fields Selection Required

This block relies on fields that you selected to perform its data actions. You must manually select the fields you want to use in your flow using the fields selector modal. To access the modal, click the white button on the block.

- fieldvalidation `fieldvalidation`

A typical wiring for [required if other fields empty](https://docs.rual.nl/block-types/field%20validation/fieldvalidation_required_if_empty): the `fieldvalidation` out pin feeds [radio](https://docs.rual.nl/block-types/Component%20UI/component_radio).

![Studio canvas example for the required if other fields empty block: typical wiring for required if other fields empty.](https://docs.rual.nl/canvas-examples/fieldvalidation_required_if_empty.png)

### Version history

Introduced in [`v10.4.28`](https://docs.rual.nl/core-versions/100428).