# Press F7 button to add Free Scheme on Basic Rate in Purchase Voucher

In the **Purchase Voucher** data entry window, when you press ‘**F7**‘ button on your keyboard at “**Basic Rate**” column attribute, “**Enter Net Rate**” window will open. In this window, you can calculate the **Scheme/Unit** value.

<figure><img src="/files/7c4dGkEJ0aCaQzXqa74y" alt=""><figcaption></figcaption></figure>

After entering the Free Scheme details, you will get the Scheme/Unit value as shown in the figure below:

<figure><img src="/files/dVJV69Cmc4slQF9iK0wW" alt=""><figcaption></figcaption></figure>


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