1. SAP S/4HANA Cloud Documentation
SAP Help Portal: "Order Reasons". This document states
"You can enter an order reason in the sales document header on the Sales tab page. The order reason describes the background of a sales transaction. This is particularly important if the transaction deviates from the normal course of business
for example
in the case of a complaint." The invoice correction process is a form of complaint processing. (Accessed for SAP S/4HANA Cloud 2402
relevant concepts are stable across versions).
2. SAP S/4HANA Cloud Documentation
SAP Help Portal: "Invoice Correction Requests". This document outlines the process of creating a sales document to correct an invoice. The requirement for an order reason is a standard configuration aspect for this sales document type (typically 'RK') to ensure traceability for the complaint. (Accessed for SAP S/4HANA Cloud 2402).