> 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/user-access/logic-global-admin/purchase/do-not-allow-change-in-lot-number-purchase-if-default-lot-number-is-specified.md).

# Do Not Allow Change in Lot Number (Purchase) if Default Lot Number is specified

**YouTube:** [How to Restrict Lot/ Batch Number Editing When a Default Lot is Specified in Purchase?](https://www.youtube.com/watch?v=_6It1oexJp0)

## How to Restrict Lot/ Batch Number Editing When a Default Lot is Specified in Purchase?

This tutorial explains how to prevent users from changing the **lot number** in a purchase voucher when a **default lot number** has been configured.

***

### **Set Default Lot Number in Purchase Voucher Configuration**

* Open **Purchase Voucher Configuration**.
* Navigate to **Other Settings 2**.
* Locate the option Labeled: **"Default Lot No** **"**
* Specify the **default lot number** to be used during Purchase Entry.

<figure><img src="/files/aBDTVj2AXIXCkH4h1hGt" alt=""><figcaption><p>As shown in the picture, define the <strong>Default LOT Number</strong>.</p></figcaption></figure>

***

### **Access Logic Admin Settings:**

* Open the **Logic Folder** and run **Logic Admin**.
* Go to **Global Settings**.
* Navigate to the **Purchase** tab.
* Locate and enable the option: **"Do Not Allow Change in Lot Number in Purchase if default lot number is specified"**.

<figure><img src="/files/P2AtR2RtMOvH82ZCbhgk" alt=""><figcaption><p>Let's keep this feature enable to observe its impact in Purchase.</p></figcaption></figure>

* Click **Save** to confirm the configuration.
* **Restart the software** to activate the changes.

***

### **Verify Functionality During Purchase Entry**

* Open the **Purchase Voucher** module.
* While making a purchase entry:
  * The **default lot number** will be **automatically selected**.

<figure><img src="/files/mNIeefhNOFj8Y2VX6fmf" alt=""><figcaption><p>As you can see in the image above, the <strong>default LOT Number</strong> has been picked automatically, and you cannot make any changes to it.</p></figcaption></figure>

* The system will **restrict any attempt to modify** the selected lot number.

***

### **Conclusion**

By enabling this setting, you can enforce data consistency and avoid unintended modifications to lot numbers during purchase entries.


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