Terms of payment of contract &1 are different from current terms

What causes this issue?

The payment terms for the current invoice are different from those in
the current contract. In contract &V1&, different payment terms were
agreed:
IF &V2& NE ' '.
Terms of payment key &V2&
ENDIF.
First cash discount period &V3& days &V4&%

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

Either you have selected further purchasing documents with different
payment terms, or you have changed the payment terms manually.

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.