After Invoice has been posted. The entries can only be reversed via a return order.
- Go to Search → Sales Return Orders and create a new return order.
- Fill in Sell-to Customer No.
- On the Actions ribbon, use the Get Posted Document Lines to Reverse Function
- In the Pop-up page, find the records to return using the Find or Filter
- Fill in the field Return Qty. to Recieve
- Post the receipt