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Serial Numbers 
You can use serial numbers to identify returned items or handing units (HU). A delivery item can have one or more serial numbers assigned to it. Serial numbers are entered in the RMA in SAP CRM and transferred to the returns delivery.
This functionality is integrated with the following systems:
● SAP CRM
● SAP ICH
● SAP EWM
The serial numbers from the returns delivery item are forwarded to SAP ICH.
The customer selects approved items in the dealer portal (on SAP ICH) and creates a return ASN (RASN), which is packed in one or more items and submitted to SAP ECC as an IDoc. The IDoc contains the assignment of serial numbers to handling unit (HU) items.
When SAP ECC receives the expected messages from the customer, it distributes the delivery to SAP EWM.
The serial numbers from the returns delivery item are forwarded to SAP EWM.
Serial numbers may change upon goods receipt in SAP EWM. The actual serial numbers are transferred to SAP ECC upon confirmation of the goods receipt.

Remember the following:
■ Differences are not supported
■ Partial cancellation is not supported
■ Only full material document cancellation is supported
SAP CRM or SAP EWM creates a stock transport order (STO), which does not recognize serial numbers. Instead, serial numbers are added upon goods issue in SAP EWM and copied to the inbound delivery, which is created in SAP ECC upon goods issue. Serial numbers are transmitted to the receiving warehouse via the inbound delivery.
For the consolidator portal, serial numbers are copied from the preceding returns delivery.
See also:
