You can easily change the “Allow adding products with zero stock” option in Moon Invoice by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. Navigate to Settings ➜ App Settings.
3. Now click on Product, then choose General, here you have an option “Allow adding products with zero stock”.
4. Choose your preference, then click Save to apply the changes.

Note: 

In the “Allow adding a product with a zero stock” option, you can get 3 options as explained below: 

• Yes Allow: Give your consent to add a product to an invoice, estimate, etc., with zero stock.
• Allow with warning: Enable adding a product to an invoice, estimate, etc., with a warning.
• Don’t Allow: Product won’t be added to an invoice, estimate, etc., if stock is not available.