> 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/purchase-voucher-configurations/other-settings-1/prompt-for-lot-number-before-saving-purchase-challan.md).

# Prompt for Lot Number before saving (Purchase/Challan)

YouTube: [How to Enable Lot /Batch No. popup before saving in Purchase?](https://www.youtube.com/watch?v=Ifn5PJclfeA)

## How to Enable Lot /Batch No. popup before saving in Purchase?

In this tutorial, we will guide you through the steps to configure a **prompt** for entering a **default LOT number** before saving a **purchase voucher or challan**. This ensures accuracy in inventory management and prevents missing LOT details.

### Steps to Configure Default Lot Number Prompt

* Navigate to the "Purchase Voucher Configuration".
* Locate the option "Prompt for Lot Number before saving (Purchase/Challan)".
* Tick the checkbox to activate this validation.

<figure><img src="/files/9llKJRHiTohDobQXT2j5" alt=""><figcaption><p>Let's keep this feature enabled to observe its Impact.</p></figcaption></figure>

### **Observe Impact on Purchase:**

* Create a New "Purchase Voucher".
* As soon as you define the **item** and its **details** and proceed to save, the software will pop up a window prompting you to enter the **default LOT number**.

<figure><img src="/files/Mk11iOGHo8C5bNf9gvNM" alt=""><figcaption><p>This picture illustrates that you need to <strong>enter the LOT number</strong> here.</p></figcaption></figure>

### Benefits

* **Organized Records:** All item stocks in a purchase will be recorded under the same lot number.
* **Error Reduction:** Confirms lot number before saving to prevent mistakes.


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