Payment conditions for document &1 differ from the current conditions

What causes this issue?

Document &V1& comes from SAP Transportation Management (SAP TM).
The payment terms for the current invoice are different from those in
the TM document.
In TM document &V1&, different payment terms were agreed:
IF &V2& NE ' '.
Terms of payment key &V2&
ENDIF.
1. Cash discount period &V3&
Days &V4&%
Either you have selected additional TM documents with different terms of
payment, or you have changed the terms of payment manually.

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.