How to replace items?
In order to replace your customer’s purchases, you must first create a Sales Return, and then create a new Sales Order of the item that was returned.
Guide on Replacing Item:
Step 1: Create a Sales Return for the item.
Step 2: Create a NEW Sales Order with the replacement item.
Step 3: Create Delivery and Invoice.
Step 4; In Collection, you may tag the previously selected Sales Return to offset the current invoice.