In case of warranty part requests, instead of invoicing, an amount has to be debited from credit account (of the receiving branch) before creating a shipment on sale order.
[You can see how non warranty or normal POs are accepted and shipments are raised at our article Accepting Purchase order (PO), invoicing and shipping the items]
1. Click on the list icon created sale order to debit from credit account
2. Enter the amount to be debited along with the tax class and update. In doing so, the total amount shall be debited from credit account of the part receiving branch.
3. Upon debits, you can create the shipment of the parts needed for service under warranty. Click the list icon and create shipment.
4. Once the shipment is create it is received at receiver branch and used the part for the service.
The faulty part from the warranty replaced shall be returned from the returns and credits queue.