Serial Number insertion into cmdb_serial_number table

[vishal_flexera]

How to setup IRE rule for cmdb_serial_number? 
Currently I am inserting records into cmdb_serial_number table, but instead of updating serial_number for the existing cmdb_ci (configuration item), it’s creating new record with the same cmdb_ci (configuration item). serial_number is unique value but not cmdb_ci (configuration item) in cmdb_serial_number. Seems identification rule not applicable for cmdb_serial_number because it doesn’t come under cmdb_ci. Anyone help me to resolve this? I also created a business rule to mitigate this new inserts and update existing, it is also not working. Instead of updating the record, it’s creating a new record with empty cmdb_ci.

BR code. 

(function executeBefore(current, previous /*null when async*/) {
    // Check if the cmdb_ci already exists in the cmdb_serial_number table
    var existingRecord = new GlideRecord('cmdb_serial_number');
    existingRecord.addQuery('cmdb_ci', current.cmdb_ci);
  //gs.info(current.serial_number + " Current ");
    existingRecord.query();
  //gs.info(current.cmdb_ci + " || "+ existingRecord.cmdb_ci );

    if (existingRecord.hasNext()) {
        // If a record with the same cmdb_ci exists, update its serial_number
    //gs.info(current.serial_number);
        existingRecord.serial_number = current.serial_number;
        existingRecord.update();

        // Abort the current insert operation
        //gs.addErrorMessage("A serial number for this cmdb_ci already exists. Serial number updated.");
        current.setAbortAction(true);
    return false;
    }
  return true;
})(current, previous);

[GB14]

@vishal_flexera  Were you able to figure this out? We are expericinging the similar issue.