Work item &: Passing on note indicator to parent & failed

What causes this issue?

The changing of the note indicator from work item &v1& to the superior
work item &v2& could not be completed successfully.
The exact reason for the error can be found by looking at the history
of work item &v2&.

System Response

The note indicator for work item &v1& was changed.
The note indicator for work item &v2& was not changed.

How to fix this error?

Please remove the cause of the error for work item &v2&.

Error message extract from SAP system. Copyright SAP SE.