Thank you for following up, Ffraga.

I'd like to help and make sure you can process the return order.

You can create a vendor credit which will decrease the quantity on hand of the items your returning.

Here's how:

1. Go to the Vendors menu.
2. Click on Enter Bills.
3. Select the Credit radio button.
4. Choose the Vendor name.
5. Put all the necessary information the same with the Bill created.
6. Select Save & Close.

You can work with an accountant and check this article to also determine which scenario is best suited for you: Record a vendor refund in QuickBooks

Here's a link that you can use as your future reference: Adjust the current balance for a vendor

Click the reply button below for follow-up questions about vendors and credits. I'm always here to help. Have a great week!