After discussion at several UMSUG meetings ELEXON have now updated the Operational Information Document (OID) with new validation rules. The changes particularly affect the relationship between Switch Regime and the controller Charge Codes. For example, a thermal photocell Charge Code is now only valid with a thermal Switch Regime. So when customer inventories are updated then anomalies will be identified by the UMSO and will probably result in rejection so that the anomalies can be corrected. We proposed the changes as it improves the quality of data entering the energy calculations by requiring review of inconsistent inventory data. Any questions please contact our team.