In the article Return Goods to Supplier (Transfer Out), we explained how to do return goods to supplier.
The steps to return serial number goods are essentially the same as returning normal goods without serial number, only different is when the outlet doing the transfer on, it must enter the serial number first before you make an inventory update as shown below.
Step 1: Please select the serial number of the product you want to return to the supplier in the column marked as shown below.
Step 2: After you have finished selecting the serial number that you want to return to the supplier, a list of product serial numbers will appear.
Step 3: Then you can save the transfer data by clicking the Save button in your top-right corner and the returned product will immediately reduce inventory at your outlet.