You create a purchase order manually or using a BAPI and create multiple account assignments for a purchase order item.

In the details of the purchase order item, you specify whether you are expecting a goods receipt. If you are only expecting an invoice receipt, you must not have created an invoicing plan, and you must have deselected the AA Chgable at IR (Account Assignment Changeable at Invoice Receipt) checkbox for the corresponding account assignment categories in Customizing for Materials Management. If you are expecting a goods receipt, it must be valuated. You do not flag the purchase order item as a returns item. If you want to create service items (item type D) and set an FAA indicator for them, you must have activated service-based invoice verification.

You create follow-on documents, such as goods or invoice receipts, with reference to the purchase order item that you created with multiple account assignments.

You set the FAA indicator in one or more account assignment items.

The system determines the final account assignment quantity from the purchase order history. To do this, the system compares the quantities posted to this account assignment item from goods receipts and incoming invoices, and sets the higher of the two as the final account assignment quantity.

You create further goods or invoice receipts for the corresponding purchase order item.

The system only distributes further quantities from partial goods receipts or invoice receipts to the account assignment item with an FAA indicator up to the level of the final account assignment quantity.