
In a purchase order, you can make an account assignment for a item if the material or service is being procured for consumption. For example, you must make account assignments for a purchase order if you order the following items:
- A material that is not planned for inventory management (a material that goes directly for consumption).
- An external service.
The quantity of a PO item can be distributed to multiple account assignment objects. When doing so, you must specify how the PO quantity needs to be distributed between the various account assignment objects.
Normally, you cannot know from the supplier invoice whether it refers to a PO with an account assignment. You can view this in the item list in Logistics Invoice Verification, where the Acct Assgt (account assignment) column displays whether the PO item has an account assignment. During invoice entry, you can display the account assignment information from PO and change it under certain conditions.
Types of Account Assignment

You use the account assignment category to define the type of account assignment. Among other things the account assignment category controls the following:
- If a goods receipt (GR) can be posted for the PO item.
- If an invoice receipt (IR) can be posted for the PO item..
If you cannot post a GR, the system suggests the difference between the PO quantity and the invoiced quantity in invoice verification.
The prerequisites for the changeability of the account assignment in invoice verification are as follows:
The Customizing settings for the account assignment category must allow that the account assignment can be changed in invoice verification. To do this, in Customizing for Materials Management, choose Purchasing → Account Assignment → Maintain Account Assignment Categories (OME9) and select the AA Changeable at IR (Acct Assgt Changeable at IR) checkbox.
A non-valuated or no goods receipt must be planned for the purchase order item.

