> 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/billing/packing-slip/packing-slip-configuration/lock-document-number.md).
# Lock Document Number
**YouTube:** [How to Prevent Document Number Changes in Packing Slips?](https://youtu.be/lVlMC_9O2_Q)
## How to Prevent Document Number Changes in Packing Slips?
In this tutorial, we will learn how to use the **"Lock Document Number"** option in Logic ERP to prevent users from manually editing or modifying the document number during Packing Slip entry.
***
### Objective of This Feature
* Prevent manual modification of document numbers
* Maintain document number sequence
* Avoid accidental changes
* Improve document control
* Ensure consistent voucher numbering
***
### Observe the Default Behavior
* Open the **Packing Slip Entry** window.
* Initiate a **New Document**.
* Observe the **Document Number** field.
**Result**
By default, the document number field is editable, allowing users to manually modify the number as required.
***
### Access to the Packing Slip Configuration
* Open the **Packing Slip Configuration** window.
* Navigate to the **Other Options 2** section.
* Locate and enable the option labeled as:
> **"Lock Document Number"**
* Save the configuration changes.
***
### Verify the Document Number Lock
* Return to the **Packing Slip Entry** window.
* Click on **New Document** to refresh the window.
* Observe the **Document Number** field.
**Result**
The document number field is now **locked**, preventing users from manually editing or modifying the document number.
***
### Key Benefits
* **Document Control:** Prevents unauthorized changes to document numbers.
* **Accurate Numbering:** Maintains the defined document sequence.
* **Prevents Errors:** Avoids accidental modification of document numbers.
* **Improved Tracking:** Ensures consistent document identification.
* **Easy Configuration:** Can be enabled whenever document numbering needs to be controlled.
***
### Important Note
After enabling **"Lock Document Number"**, click **New Document** to refresh the entry window and apply the setting.
***
### Final Outcome
Once **"Lock Document Number"** is enabled, Logic ERP automatically locks the document number field in Packing Slip entry, ensuring that users cannot manually modify the assigned document number.
---
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