How To Reprice A Return Order?

Summary:

The user has created a sales order and returned some of the lines. When they reprice the order, they made a discount and with the new unit price, the amount has became freater than 0. Unfortunately they realised this issue after they received the RMA.

Content (required):

How can we reprice this return order in order to make the amount negative?

Version (include the version you are using, if applicable):

23A

Code Snippet (add any code snippets that support your topic, if applicable):