# Allow -ve Bill Amount Only for Credit Bills
**YouTube:** [How to Allow Negative Bill Amount Only for Credit Bills?](https://www.youtube.com/watch?v=1LzBI596GIc)
## How to Allow Negative Bill Amount Only for Credit Bills?
In this tutorial, we will cover a special configuration that allows saving a **negative bill amount**—**only when the bill is in credit mode**. This is especially useful in scenarios like product returns or exchanges where the customer is owed a balance.
***
### Understand the Default System Behavior
Let’s take a typical case:
* A customer returns or exchanges an item.
* The new item costs **less** than the original one.
* This results in a **negative bill amount** (e.g., ₹-320).
**Default Restriction:**
When you try to save this bill—whether in **cash** or **credit** mode—the system shows an error:
> *"Negative bill amount is not allowed."*
This means you **cannot proceed** unless the bill total is zero or positive.
***
### Enable the Option for Credit Bills
To handle such return cases correctly, Logic ERP provides a setting to allow negative bills in **credit mode only**.
**How to Enable:**
* Open **Logic Admin**
* Go to **Global Settings**
* Navigate to **Sales Settings - 1 Option**
* Locate and enable the option labeled as \
\&#xNAN;**"Allow -ve Bill Amount Only for Credit Bills"**
* **Save** the settings and **restart** the software
***
### Implement the Behavior After Enabling
Let’s try the same return scenario again:
* Open the **Sale Voucher** screen
* Add the **returned item**
* Add the **exchanged item** (of lower value)
* Total becomes **negative** (e.g., ₹-513)
**Case 1: Cash Mode**
* Select **Cash** as the payment mode
* Try saving the bill
> Result: System **still restricts** the entry\
> Message: Payment Entry is More Than Bill Amount by Rs.:-513.00*.*
**Case 2: Credit Mode**
* Select **Credit** as the payment mode
* Save the bill
> Result: **Bill is saved successfully**\
> The amount will be treated as a **credit note** that the customer can use in future purchases.
***
### Use Case & Benefits
| Scenario | Why It's Useful |
| ------------------------------- | -------------------------------------------------- |
| Item exchanges with lower value | Allows smooth return without immediate cash refund |
| Retail returns | Enables issuing of store credit |
| Credit settlement | Makes it easier to track customer balances |
***
#### 📝 Final Notes
* The setting ensures **negative billing is restricted to controlled credit cases** only.
* Always communicate with your accounting or audit team when enabling such options for clarity in reporting.
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