I'm updating employee records from a database. I can not get the Update to work. I've mapped the entityId to NS, but the employee record is not being found. When I tried using UPSERT, it's not locating the existing record and sometimes it creates a new employee record. After that record is creating, subsequent updates work just fine. I've attached the @externalId that's needed for UPSERTS to work. Any help is greatly appreciated.