Step 1: Go to “Sales” and select “Invoices”.
Now, click on the “Document Settings” Option at the top right corner of the screen.
Step 2: Allow the negative quantity.
Go to the “Allow Negative Quantity” column under the “Additional Customizations” section and switch on the toggle bar.
Step 3: Click on “Update Settings”.
Click on the “Update settings” option present at the top right corner of the screen.
Congratulations! You have successfully updated document settings, and a pop up appears at the top of the screen informing the same.
From now on you can add negative quantity products to Invoices.