Hi Dwity
is it a standard workflow or a custom workflow?
Can you please give the screen shot of the error when the user is trying to execute the step?
Can you give the step history screen shot of the main WF and the Decision item which was supposed to be terminated (from the technical WF log)?
Did we check SLG1 also at the time when the leave cancelled? Also check SM13/14 for any async update failures.
Regards,
Modak