How do we return the rejected quantity to vendor?  Assuming that all the process completed me21n po creation --> me29n release --> migo --> miro.
Now quality dept rejected 50% quantity, so how how to return this quantity through sap?

See below steps and transaction codes for return to vendor:

When Quality department decide that the materials need to return to vendor, Purchasing department need to informed the vendor. 

Faulty components stock is transferred to the RTN store under Blocked stock due to Vendor Returns. 

No. / Step Step Description                         Transaction Code            Input Data / Special Information 

1) Create Return PO
- Save PO and note the PO number
- Return PO not subjected to approval          ME21N                          Doc type = 
                                                                                                       Return indicator = “tick” mark
                                                                                                       Mat Number = 
                                                                                                       Storage Loc = 

2) Goods receipt the return PO
- note the movement type 161 is defaulted     MIGO                            Stock Type = Blocked 

3) Print Material Document                          MB90 

4 Generate report to list outstanding credit memo
- Note the “To be invoiced” is negative          ME2L                            Selection parameters = RECHNUNG(open invoices)
                                                                                                        Document Type = 

5 Raise Credit memo for the Return PO MIRO 

SAP MM Reference Books:
SAP Material Management Interview Questions, Certification and Configuration Books

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