---
title: How to make a corrective action field required based on another field's numerical range
description: You can make the 'Comment - Corrective Action' field required based on the value of another field by setting up a specific series of validation rules on the comment field itself.
---
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# How to make a corrective action field required based on another field's numerical range
## You can make a comment or corrective-action field required based on the value of another field, by setting up a series of validation rules on the comment field itself.
In this example, the validation is set on the **Corrective Action** field, based on the value of **Field A**. **Field A** is valid between 5 and 8; outside that range, **Corrective Action** becomes mandatory.
You'll create three rules on **Corrective Action**, checked from top to bottom.
#### **Step 1 — Mark as valid when Field A is in range**
This rule marks **Corrective Action** as valid, and optional, when **Field A** is within its normal range:
```
(data["FieldA"] >= 5) && (data["FieldA"] <= 8)
```
- **Mark form as:** Valid
- **With message:** "No action needed."
#### **Step 2 — Mark as valid when Field A is out of range and Corrective Action is filled**
This rule marks **Corrective Action** as valid only if **Field A** is out of range (0–4.99 or 8.01–10) and a comment has been entered:
```
(((data["Field A"]>=0)&&(data["Field A"]<5))||((data["Field A"]>8)&&(data["Field A"]<=10)))&&(data["CorrectiveAction"]!=0)
```
- **Otherwise, mark form as:** `Valid`
- **With message:** "Corrective action provided.
#### **Step 3 — Add the catch-all invalid rule**
This rule makes **Corrective Action** invalid if **Field A** is out of range and the comment has not been filled in:
```
((data["Field A"]>=0)&&(data["Field A"]<5))||((data["Field A"]>8)&&(data["Field A"]<=10))
```
- **Otherwise, mark form as:** `Invalid` or `Error`
- **With message:** "A corrective action comment is required when the value is out of range."
---
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