# Credit Note Validity (Days)
**YouTube:** [How to Configure Credit Note Validity Period for Linking in Sale Bill?](https://www.youtube.com/watch?v=XvLm4Xr8g_M)
## How to Configure Credit Note Validity Period for Linking in Sale Bill?
In this tutorial, we will guide you through the process of enabling a setting in Logic ERP that restricts the use of expired credit notes during the sale billing process. This helps ensure financial accuracy and prevents misuse of outdated credit notes.
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### **Enable Credit Note Validity Period**
* Open **Logic Admin**.
* Navigate to **Global Settings**.
* Go to **Sale Return Settings**.
* Locate the option: **"Credit Note Validity in Days"**.
* Enter the number of days that define the validity period for credit notes (e.g., 6 days).
* Click **Save** to apply the changes.
* Restart the software to activate the updated configuration.
***
### **Implement the Configuration During Billing**
* Open the **Sale Voucher** screen.
* Enter item details as usual.
* Press **F3** and click on the **Link** button to attach a Sale Return (Credit Note).
* A list of pending **Sale Return vouchers** will appear.
* Select a **Sale Return** voucher from the list.
* If the selected credit note is **older than the defined validity period**, the system will display the following message:
> **"Credit Note has expired."**
* The software will **prevent linking** the expired credit note to the sale bill.
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### **Conclusion**
By configuring the **Credit Note Validity** setting, Logic ERP helps maintain strict control over the usage of credit notes, ensuring they are used within a predefined and valid timeframe. This feature strengthens your billing process and prevents errors due to outdated returns.
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