Hello,
I am finding same issue. In debugging I cann not see any difference between a "Completed" Ticket and a "Marked as Irrelevant" ticket. I have tried analyzing All Irrelevants default set in OWL but I can not see any defined criteria. I suspected about "ServiceExecutionRevelanceIndicator" but in debugging the values for this indicator was allways false. Did you find the solution?
Regards,
Jesús.