System ID This field represents the submitting entity internal system from which data is sourced. The default value is 0, representing the initial system from which the data is pulled. Place the value 0 on all records initially. If a system changes, increment increase the value by an increment of 1. For example, if a system changes, the value would change from 0 to 1. If it changes again, the value would change from 1 to 2. This ID represents the system at the record level. Some submitting entities combine data from multiple systems into a single submission. If one of these systems changes, the system ID would be incremented on the records from the changed system. The system ID on the remaining records would not change. | 