# Do Not Allow -ve Bill Amount
**YouTube Link:** [How to Disable Negative Bill Amount in Sale Bill?](https://www.youtube.com/watch?v=S5XkwGZ2NcA)
## How to Disable Negative Bill Amount in Sale Bill?
In this Tutorial, we'll demonstrate how to prevent negative bill amounts during billing in Logic ERP.
**Steps to Prevent Negative Bill Amounts:**
1. Navigate to the *Sale Voucher Configuration*.
2. Select the relevant billing series.
3. Enable the option "Do Not Allow -ve Bill Amount".
Let's enable this feature and observe its impact
* **Save Changes:** Ensure all changes are saved to update the settings.
**Scenario Illustration:**
* Generate a sales bill for a party.
* Enter the return of all 15 units.
* Observe that the bill amount becomes negative due to the replacement product being lower in value than the return product.
After enter return items. Software has displayed Amount in negative
**Error Prevention:**
* The software prompts an error when trying to save a bill with a negative amount, ensuring accurate financial management.
Here you can observe Software has prompted an error for Negative Bill amount.
