> For the complete documentation index, see [llms.txt](https://kb.logicerp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.logicerp.com/logic-erp-learning-hub-tutorials-and-best-practices/setups/configurations/sale-voucher-configuration/other-settings-1/do-not-allow-bill-numbers-in-back-date.md).

# Do Not Allow Bill Numbers in Back Date

**YouTube:** [How to Restrict Entry of Backdated Bill Numbers in Sale?](https://www.youtube.com/watch?v=RNf6q64ZS2k)

## How to Restrict Entry of Backdated Bill Numbers in Sale?

In this Tutorial, we demonstrate how to configure your settings to disallow backdated bill numbers, thus ensuring data accuracy and preventing record discrepancies.

### Step-by-Step Guide

* Navigate to the Sale Voucher Configuration
* Select the Relevant Billing Series.
* **Enable Do Not Allow Bill Numbers in Back Date**: Find the option to "Enable Do Not Allow Bill Numbers in Back Date" and tick the checkbox to avail this functionality.

<figure><img src="/files/A3apyz6ygUu8HjrriiTg" alt=""><figcaption><p>Let's enable this feature and observe its impact in Billing</p></figcaption></figure>

* **Save Changes:**
  * Ensure all changes are saved to update the settings.

### Let us Understand with Example

* **Today's Date:** December 9, 2024
* **Last Generated Bill Number:** GST-17

### Sale Bill Creation with Back Date

Attempt to generate the next bill, GST-18, with a backdated entry set to December 4, 2024. The software should prompt an error message, confirming that backdated bill numbers are not allowed.

<figure><img src="/files/npOCqbwK7MYDseHUB5ZM" alt=""><figcaption><p>The software displays an error message indicating that backdated bill not allowed.</p></figcaption></figure>

#### Conclusion

By following these steps, you ensure your sales data remains accurate and free from discrepancies. Thank you for watching. Like, share, and subscribe for


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