If you are recording your the return of services separately, use the Amend Services/Free Text Items for Creditoption. You can reprint the despatch note if required.
Open: Sales Order Processing > Order Processing > Confirm Services and Free Text Items > Amend Services/Free Text Items for Credit.
Select the item from the displayed list and click Amend.
Note: To view full detail of the click View Return.
Other tasks
Record return of free text and labour/service items
Reference