Conditions cannot be processed using this setting

What causes this issue?

You selected purchase-order-based invoice verification and valuation on
the goods receipt date.
The system determines the conditions for each goods receipt separately,
and they can therefore differ from each other.
Since you selected PO-based invoice verification, the system groups
together the various goods receipts. It is therefore not possible for
the conditions to be uniquely assigned to the goods receipts.

System Response

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

How to fix this error?

Correct the value of the invoice item by changing the item value.

Error message extract from SAP system. Copyright SAP SE.