I wrote the following BR rule to concatenate the values of the parent and child reference fields, store them in a variable, and then glide and update the "Name" field on the Parent record with the concatenation if the condition meets. I'm not sure what should be the "When to Run" condition if records are inserted in the relationship table (cmdb_rel_ci_list) through discovery or if the records are updated.
(function executeRule(current, previous /*null when async*/ ) {
var sys = current.getValue('parent');
var concat = current.getDisplayValue('parent') + '@' + current.getDisplayValue('child');
var app = GlideRecord('cmdb_ci_appl_XYZ');
app.addEncodedQuery('xyz');
app.query();
while (app.next()) {
if (app.sys_id == sys) {
app.name = concat;
app.update();
}
}
})(current, previous);
