Save the conditions changed in invoice document & / &

What causes this issue?

Before you can process a different invoice document, you must save the
changes to the conditions in invoice document &V1& / &V2&.

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?

Choose Save before you continue processing the next invoice document.

Error message extract from SAP system. Copyright SAP SE.