Final account assignment quantity exceeded for account assignment item &1

What causes this issue?

A quantity currently posted to the account assignment item &V1&, which
has a final account assignment indicator, exceeds the
<DS:DE.AA_FINAL_QTY>final account assignment quantity</> for this
account assignment item.

System Response

This is an error message. With this distribution of quantities you
cannot post the invoice document to the account assignment items.

How to fix this error?

To adjust the distribution of quantities as necessary, go to the item
overview and choose the multiple account assignment screen for the
relevant invoice item.
When you process parked invoices that reference a purchase order with
multiple account assignments, the multiple account assignment screen
shows, as well as the account assignment information at the time of
parking, the <DS:DE.AA_FINAL_IND>final account assignment indicator</>,
the final account assignment quantity and the <DS:DE.AA_OPEN_QTY>open
quantity</>. Use the <LS>update account assignments</> pushbutton to
transfer the current account assignment data from the purchase order
(account assignment objects, newly added account assignment items). If
goods-receipt-based invoice verification is active in the purchase order
item, the system only transfers newly added account assignment items if
they are referenced in the currently invoiced goods receipt.
Then adjust the quantities for the account assignment items accordingly.
Since the system does not display any quantities at account assignment
level when you are using distribution by amount, you need to change the
total quantity as appropriate. The system redistributes the quantities
internally at account assignment level. You can also trigger this
redistribution using the <LS>update account assignments</> pushbutton.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.