The problem facing is sometimes a terminating event is getting triggered but not able to receive by the receiver function module. Some screen-shots of same is attached below.
Kindly tell me if you find any possible cause for this issue.
Screen-shot taken from 'SWEINST' t-code
These are actully sub workflows terminating event, so if any one of sub-workflow doesn't get completed the WI stays in user inbox and Main WF get stucked there.