For the scenario that you ship the wrong item to customer, and you will replace the item to customer when they return the item to you.
Step-by-step guide
1, Use search function to find Sales Return Order
2, Click New
3, In General Tab, enter Customer Name and External Document No
4. Select Process => Get Posted Document Lines to Reverse...
5. Select Posted Sales Document Line to return
(1) by default, option for Posted Invoices for the customer to be shows
(2) select the posted sales invoice line for return
(3) Click OK for confirm the selection
