Workflow & step &: Work item & for step & could not be completed

What causes this issue?

Step no. &V2& requires that the superfluous work item &V3& of step &V4&
of the respective workflow definition is completed.
However, the work item &V3& could not be completed, possibly because it
has already been completed. It now has the status '&V1&'.

System Response

The processing of the workflow was resumed after step &V4& with the
event <ZH>processing obsolete</>.

How to fix this error?

If the work item &V3& has not already been completed, you should check
the history of the work item where further information may be logged on
the cause of the problem.
You may need to complete the work item &V3& manually or terminate it to
prevent it being executed. Otherwise inconsistencies may arise when the
workflow concerned is executed.
(Also see help on 'control commands for workflow control')

Error message extract from SAP system. Copyright SAP SE.