Document cannot be cancelled

What causes this issue?

You are attempting to cancel a document containing unplanned delivery
costs. This is not possible, as the setting determining how unplanned
delivery costs are posted was changed in Customizing for Invoice
Verification.

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?

Check the Customizing setting. To cancel the document, you must change
the setting determining how unplanned delivery costs are posted.
(After making the change, call up the function 'Cancel Invoice' again.)

Error message extract from SAP system. Copyright SAP SE.