Order item & &: you can only enter higher supplier invoice amount

What causes this issue?

You flagged the invoice item for order item &V1& &V2& as having a
supplier error or as an unclarified error. For this order item the item
amount in the invoice is &V3&. This is smaller than the item amount of
&V4& suggested by the system.

System Response

You currently cannot enter an amount that is lower than expected by the
system. This would lead to a credit memo on the part of the supplier.

How to fix this error?

You can change the default values to match the invoice and then post the
invoice.

Error message extract from SAP system. Copyright SAP SE.