> 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-installation-configuration-and-troubleshooting-solutions/faqs/sales/bill-saving-under-latest-bill-number.md).
# Bill Saving Under Latest Bill Number
**YouTube:** [How to Resolve ‘Bill Saving Under Latest Bill Number’ Issue in Sales Bills?](https://www.youtube.com/watch?v=1ntSm_M5ZKA)
## How to Resolve ‘Bill Saving Under Latest Bill Number’ Issue in Sales Bills?
This tutorial explains how to manage the warning message:\
\&#xNAN;**“Bill number already exists. Save under latest bill number”** in Logic ERP, and how to prevent this issue from occurring in future transactions.
***
### **Objective of This Feature**
* Understand why duplicate bill number warnings appear
* Verify existing bill entries
* Prevent manual duplication of bill numbers
* Maintain proper bill sequence automatically
***
### **Understand the Warning Message**
**System Prompt**
* While saving a bill, the system displays:
* **“Bill number already exists. Save under latest bill number”**
**Meaning**
* The bill number entered already exists in the system
* If continued, the software will save the bill using the **next available bill number**
***
### **Verify Existing Bill Number**
* Open **Sale Bill** window
* Right-click on **Modify Option**
* Search the Bill Number shown in the warning message
**Result**
* The same bill number is already available in the system
***
### **Handle the Existing Bill**
* **Modify** the existing bill if changes are required
* **Delete** the earlier bill if it was created incorrectly
***
### **Prevent Duplicate Bill Numbers in Future**
* Go to **Configuration Menu**
* Open **Sales Voucher Configuration**
**Setup**
* Select the relevant **Sales Bill Series**
* Navigate to **Other Settings 1**
**Lock Bill Number Field**
* Click on **Column Locks**
* Search for **Bill Number Field**
**Action**
* Lock the field
* Save the configuration
***
### **Verify Functionality**
**System Behavior**
* Bill Number can no longer be changed manually
* System automatically generates bill numbers in sequence
***
### **Key Benefits**
* Prevents duplicate bill numbers
* Maintains automatic bill sequencing
* Reduces manual errors
* Improves billing accuracy and control
***
### **Best Practice Tips**
* Avoid manual editing of bill numbers
* Regularly monitor bill series configurations
* Use column locks for critical fields
* Train users to follow automatic numbering process
***
### **Final Outcome**
* Duplicate bill number issue is prevented
* Bills are saved in proper sequence automatically
* Improved accuracy and consistency in billing
* Better control over voucher management
---
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