Careful with the answers.

In these quality related processes in the supply chain two different processes are recognized.

• The first is called Return Material Authorization (RMA)
• The second is called Discrepant Material Report (DMR)

 You are asking how to register a RMA, that means that a customer has contacted you and wants to return goods to you. This contact will in the vision of ODOO, be processed by the support desk (the Helpdesk module covers that functionality). After creating a RMA the support desk hands over the RMA to the customer, so that the return is recognized when received back and will be attached to the corresponding sales order.

The other way around will be initiated from the Inventory module. This quality related process will come in play when goods received from the vendor do not meet the quality requirement. So they are Returned to the vendor. In this case you contacted the vendor for a RMA and return the goods with that information to the vendor. This information is now related to the purchase order.

Hope this will help to determine when which process comes in play and where to look for this functionality in ODOO.