SD Return Order Process
Return process is a common process in SD. Customer may be not satified with the deliveried goods or the deliverable is not what customer exactly want. In these case, customer want to initiate the return process. SAP has provided standard steps for return process.
Sales department creates return order using transaction VA01. Standard return order type is RE. It can be copied out and adapted according to custom requirement. The return order can be created with reference to sales order or billing document.
Sales department creates return delivery document using transaction VL01N. The standard return delivery document has delivery type LR. This delivey type is configured in return order type RE. Below pic shows their relationship.

After the return delivery document has been created. Logistics department can post the document and receive the return goods to the warehouse.
Finance department creates credit memo using transction VF01. The money can be refunded to the customer. The returned goods need to inspected and moved to corresponding area using different movement type(such as 453, 459). Transaction MB1B can be used for this purpose.
After the goods has been returned to plant. The customer may request good replacement or refund. For the first option, the subsequent activity is create another standard sales order and follow the standard sales process: sale – delivery – billing – payment. If customer choose refund, the money can be refunded to the customer using credit memo.