# Do Not Allow Blank Bill No

YouTube: [How to make Bill Number mandatory in Purchase Voucher - Logic ERP Software ?](https://www.youtube.com/watch?v=3NQIteup3_I)

## How to make Bill Number mandatory in Purchase Voucher - Logic ERP Software ?

Welcome to Logic ERP Tutorial, on preventing blank bill numbers in Purchase Voucher

#### Enabling Bill Number Validation

1. Navigate to the "Purchase Voucher Configuration".
2. Select the option "Do Not Allow Blank Bill No".
3. Tick the checkbox to activate this validation.

<figure><img src="/files/jA1Cr4RF7JF7plTaP3yX" alt=""><figcaption><p>Keep This Feature Enabled and Observe Its Impact</p></figcaption></figure>

#### Demonstrating the Functionality in Purchase :

* Create a "Purchase Bill".
* If you attempt to make a purchase entry without a bill number, the software will prevent you from proceeding further.

<figure><img src="/files/SWh5ZggQlQTJKZtOLdib" alt=""><figcaption><p>As you can see in the picture, the software is not allowing further progress.</p></figcaption></figure>

***


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://kb.logicerp.com/logic-erp-learning-hub-tutorials-and-best-practices/setups/configurations/purchase-voucher-configurations/other-settings-1/do-not-allow-blank-bill-no.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.