> 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/prompt-for-duplicate-bill-no..md).

# Prompt for Duplicate Bill No.

**YouTube:** [How to Enable the Notification for Duplicate Bill No. in Sale?](https://www.youtube.com/watch?v=UHLhcibGV5M)

## How to Enable the Notification for Duplicate Bill No. in Sale?

### Steps to Enable Duplicate Bill Number Alerts

1. **Navigate to Sale Voucher Configuration**: Access the configuration settings in Logic ERP.
2. Enable **'Prompt for Duplicate Bill Number'**: Look for the option and toggle it on. This ensures you're alerted to any duplicate entries, safeguarding your sales records.

<figure><img src="/files/4aHGzZ6HIZpWzXJ8CL7S" alt=""><figcaption><p>  Let's keep this feature enabled and observe its impact.</p></figcaption></figure>

### Demonstration

* Create a sale bill with document number 17 and save it.
* Attempt to create another sale bill with the same number.
* The system will notify you that the bill number already exists, preventing errors.

<figure><img src="/files/LwaZyiRTNFl5wDWLDNq8" alt=""><figcaption><p>A popup alert for a duplicate bill</p></figcaption></figure>


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