Ok. So you are terminating task in application program using
EXEC CICS SET TASK(data-value) FORCEPURGE END-EXEC
This terminates the task but results in an ABEND in that region.
I am sure that this is bound to happen. I am not quite sure why is that you are worried about the abend in CICS region.
If it is coming inn the reports, the "force purged" abends will have specific abend code and they can be ignored or separated out per the user's descretion.