T codes used for PRPO routed invoices, tcode for manually processing invoice, Tcode for credit note. Why credit note is issued, Reason of PO and invoice mis match. Process improvement and how it was benifical.

T codes used for PRPO routed invoices, tcode for manually processing i

1.	T codes used for PRPO routed invoices, tcode for manually processing invoice, Tcode for credit note. Why credit note is issued, Reason of PO and invoice mis match. Process improvement and how it was benifical.
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