Anyone have any idea about this ?Following screenshots shows the places tat exception comes.Hi ,I got a concurrentModification exception when I'm trying to run larger(400 000) data set with Samoa. That exception comes from the AMRRuleSetProcessor. AMRRulesSet processor has a list name as ruleSet and that list contains rules. At the processInstanceEvent method, this list would be modified. At that point, this exception comes and stop the process.