Incoming invoice &3 &4 for PO &2 posted to alternative account &1

What causes this issue?

The system found an incoming invoice for the current purchase order,
which was posted to the alternative account &V1&.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.