# Retail Customer Mandatory in Billing

## How to Enable Mandatory Selection of Retail Customers in Sale Bill.

**YouTube Link:** [How to Enable Mandatory Selection of Retail Customers in Sale Bill ?](https://www.youtube.com/watch?v=CawEqs7_0yw)

Enable the **'Retail Customer Mandatory in Billing'** option in Logic ERP to ensure accurate customer linkage in transactions. Follow these steps to activate the feature:

1. Navigate to **'Sale Voucher Configuration'**.
2. Choose your billing series.
3. Check the box for **'Retail Customer Mandatory in Billing'**.
4. Save the settings.

### Let's see how this works.

<figure><img src="/files/Dyw3jkOlk9n4iDbe61CK" alt=""><figcaption><p>The image above indicates that the option is currently enabled. </p></figcaption></figure>

Try to generate a sales bill without selecting a retail customer. When you attempt to save, you'll receive an error message telling you that customer selection is mandatory.&#x20;

<figure><img src="/files/xHa1pLa7b8fFMb7bGg8N" alt=""><figcaption></figcaption></figure>

Now, enter the necessary customer details and save the bill again.

As you can see, once the retail customer details are entered, the sale bill saves successfully.&#x20;


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