Looking at the process documentation, Alex investigates the concepts of GR/IR clearing and the three step reconciliation in SAP S/4HANA Cloud. She notes the following key points:
The three-step reconciliation is the standard procedure for posting procurement transactions in accounting.

Three-Step Reconciliation
The process involves the following steps:
- Purchase order
This step is carried out exclusively in materials management. There is no data posted in FI but account assignments, prices, etc. are already defined here.
- Goods receipt
When the goods are received and to update the inventory, a material document. At the same time, a financial document is created that posts the value of the goods to the material stock account or the consumption account (debit). This document is also used to post the value as an open item to the GR/IR account (credit).
- Invoice receipt
The vendor invoice is posted in MM. At the same time, a document is created in FI. This FI document contains the invoice amount that is posted to the goods receipt and invoice receipt account (debit), and to the vendor account (credit).
The last two steps can be completed in reverse order, depending on when the goods and the invoice are received.
Maintenance of Goods Receipt and Invoice Receipt Clearing Accounts

All goods and invoice receipts are collected on GR/IR accounts. If amounts and prices match, they are automatically cleared by the system. However, not all items can be cleared automatically, for various reasons:
Invoice or goods receipt is missing.
Amounts do not match.
Purchase order item was created with an outdated price list.
Delivery costs were posted on the wrong GR/IR account.
The GR/IR account reconciliation process is an exception-handling process for all purchase order items with differences between goods receipts and invoice receipts.
It is recommended to maintain the GR/IR clearing account on a monthly basis. This means that purchase orders and accounts should be adjusted immediately after the actual transactions.