To create purchase return for a product with serial number on mobile please follow the below steps:
Step 1: Click on Bills in your swipe application
Step 2: Select More and click on Credit Notes to create purchase return.
Step 3: Add the customer and product in your credit note.
Step 4: While adding product, select the serial number of product that you want to create purchase return for by clicking on +.
Step 5: After adding all the required details for your credit note click on Create.