The process of adjusting or correcting the customer's invoice is represented by invoice corrections (document type RK). The document type RK enables you to create a single correction document for your invoice rather than two separate documents (one for debit and one for credit) as is the case with debit and credit sales documents. The header and item data make up the document's structure. There are always two things in the item data. Always a debit item comes first, followed by a credit item. The total of the two lines resulting in an increase or decrease in the original invoice amount is the net invoice correction amount.
Document type RK is categorized as an invoice correction document by the document category (value K) and the indicator field (value D). Value M is present in the reference required field when configuring for the RK document type. Due to this, the document type can only be created using an invoice document as a reference. The document type RK generates an order-relevant billing, G2, but is irrelevant for delivery. When customizing for document type RK, a default billing block is present to provide correct validation by authorized person before the RK document may be billed. Standard SAP provides the item categories G2N and L2N for usage with the RK document type.
Figure 1 Sales Order Type View - RK
