how to write a business rule for parent table..?which runs for all child table on update on any in child tables..

[Naveen Kokkirap]

need to write business rule. for entity which has applies to record field it is dependent on tables.. 

when we trying add any cmdb_ci(parent table) tables the field owner will be  populated in an entity owner field,..

for this we need to write BR for parent tables... any Script ideas

[Harish KM]

You can glide child table from parent example below 

Incident --> parent

incident task -->child

BR on incident table

    var inc= new GlideRecord("incident_task");
inc.addQuery("incident",current.getValue("sys_id")); // relation between incident and incident task (reference field)
inc.query();
while(inc.next())

{
//do what you want
}