@Sanket Pawar Here is the before Insert business rule you need to create on the incident table.
(function executeRule(current, previous /*null when async*/) {
// Add your code here
var glideIncidentParent = new GlideAggregate('incident');
glideIncidentParent.addQuery('parent_incident',current.parent_incident);
glideIncidentParent.addAggregate('COUNT');
glideIncidentParent.query();
if(glideIncidentParent.next()){
var incidentCount = glideIncidentParent.getAggregate('COUNT');
if(parseInt(incidentCount)>=10){
gs.addErrorMessage('Maximum child count for incident reached.');
current.setAbortAction(true); //Abort incident creation
}
}
})(current, previous);
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