Invoice cannot be automatically reduced

What causes this issue?

You tried to automatically reduce an invoice. The system discovered
that the amount of the discrepancy (&V1& &V3&) is greater than the sum
of the tax base amounts of the tax categories (&V2& &V3&).

System Response

The invoice cannot be automatically reduced.

How to fix this error?

You can either:
manually accept the difference. The system will then post it to a
separate expense account.
reject the complete invoice.

Error message extract from SAP system. Copyright SAP SE.