> 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-2/default-lot-number.md).
# Default LOT Number
**YouTube:** [How to Set the Default Lot Number in Purchase?](https://www.youtube.com/watch?v=UQ5uUcLrYBE)
## How to Set the Default Lot Number in Purchase?
In **Logic ERP**, you can set a **default lot or batch number** for **purchase transactions**, ensuring consistency and reducing manual input errors.
### **Configuring Default Lot/Batch Number**
* Navigate to the **Purchase Voucher Configuration.**
* Click on **Other Settings-2.**
* Locate the option **"Default Lot Number"**.
* Enter the preferred **Lot or batch number** and **Save** the configuration.
This picture illustrates how you can set the default LOT number.
### **Auto-Picking the Default Lot in Purchase**
* Create a **new purchase voucher**.
* The system will **automatically populate** the predefined **lot or batch number** when entering items.
As you can see, the LOT number has been automatically picked in the billing.
### **Conclusion**
This feature **streamlines purchase entries**, reduces manual efforts, and ensures **accurate lot tracking** in inventory.
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