# Do Not allow Blank Challan No. in case of Sale Return

**YouTube:** [How to Make Challan No Entry Mandatory in Sale Return?](https://www.youtube.com/watch?v=ScaFTuS7flE)

## How to Make Challan No Entry Mandatory in Sale Return?

In this tutorial, we’ll demonstrate how to enable a validation feature in Logic ERP that **prevents saving a Sale Return entry** if the **Challan Number** is left blank. This ensures data accuracy and compliance during return transactions.

***

### **Enable the Setting in Logic Admin**

* Launch **Logic Admin**.
* Navigate to **Global Settings**.
* Go to the **“Sale Return Settings”** section.
* Locate and enable the option labeled: **"Do Not Allow Blank Challan No. in Case of Sale Return"**.

<figure><img src="/files/rHGdpkoA7lKLOzNHd9Wm" alt=""><figcaption></figcaption></figure>

* Click **Save** to apply the changes.
* Restart the software to activate the new setting.

***

### **Implement the Validation During Sale Return Entry**

* Open the **Sale Return Voucher** screen.
* Try to save a return entry **without entering a Challan number**.

> The software will display a prompt:\
> \&#xNAN;**"Please fill in the Challan number."**

<figure><img src="/files/8NaIRhj1V6DMlPTrFYKx" alt=""><figcaption></figcaption></figure>

***

### **Enter Required Challan Details**

* Navigate to the **“Other Details”** section of the voucher.
* Enter the **Challan Number** and **Challan Date**.

<figure><img src="/files/Ooqqg6Khgx5o66DxeQcH" alt=""><figcaption></figcaption></figure>

* After filling in the required fields, click **Save**.

> The entry will now be saved successfully.

***

### **Conclusion**

By enabling the **“Do Not Allow Blank Challan No.”** option, Logic ERP ensures all sale return vouchers include mandatory Challan references. This feature helps maintain transaction accuracy and traceability.


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