System can distribute maximum total quantity &1 &2 to selected items

What causes this issue?

You have selected account assignment items across which you want the
system to distribute the total quantity of the invoice item. As you have
only selected account assignment items for which the
<DS:DE.AA_FINAL_IND>final account assignment indicator</> is set in the
referenced purchase order, the total quantity to be posted must not
exceed the sum of the <DS:DE.AA_OPEN_QTY>open quantities</> for these
account assignment items. If the total quantity is higher than the sum
of the open quantities, the system cannot automatically distribute
quantities across the account assignment items.

System Response

The system cannot distribute a total quantity of this magnitude across
the account assignment items with a final account assignment that you
have selected.

How to fix this error?

Adjust the current total quantity to the sum of the open quantities,
either by reducing the total quantity, or by selecting additional
account assignment items to which the system can distribute the total
quantity.

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.