REF	WHEN	ACTION	FROM	TO	INFORMATION REQUIRED	METHOD
1.2.1	Following receipt of CoS notification from CSS, within 1WD	Validate status of MSID and prospective Supplier. If an MHHS MSID is being Switched to a Supplier who is not a MHHS Supplier, then Provide site information, registration details of the old Supplier, and confirmation the Meter is Registered to New Supplier	SMRA	New Supplier	D0217 Confirmation of the Registration of a Metering Point / D0260 Notification from MPAS of Old Supplier Registration Details	DTN Message
1.2.2	Following receipt of Registration details, within 2WD	Appoint legacy agents The Gaining Supplier shall populate the Service Reference (J0274) and Service Level Reference (J0275) with REVM to indicate a MHHS Reverse Migration is being initiated.	New Supplier	Incoming DC / MA Incoming MOA Incoming DA	D0155 Notification of Meter Operator or Data Collector Appointment and Terms D0153 Notification of Data Aggregator Appointment and Terms	DTN Message or other agreed method
1.2.3	After processing D0155s, within 2WD	Accept (or reject) appointments	Incoming DC Incoming MOA Incoming DA	New Supplier	D0011 Agreement of Contractual Terms Or, for rejection: D0261 Rejection of Agent Appointment	DTN Message
1.2.4	Within 1 WD of receiving all applicable D0011s	Send appointment details of MS	New Supplier	Incoming DC Incoming MOA	D0148 Notification of Change to Other Parties The D0148 should be populated in the same way as a New Connection, where details of only the incoming agents are required.	DTN Message
1.2.5	Following receipt of D0011s, within 2WD	Update Agent appointment details. If D0205 is not received before SMRA sends IF/PUB-003 (3.3.6) then the IF/PUB-003 will not contain the identities of incoming DC and MOA.	New Supplier	SMRA Incoming DC	D0205 Update Registration Details (where applicable) D0052 Affirmation of Metering System Settlement Details	DTN Message
1.2.6	At 18:00 following Secured Active	Issue de-appointment notifications for Metering and Data Services	SMRA	Outgoing MOA Outgoing Data Service Old Supplier LDSO EES	IF/PUB-003 Notification of Reverse Migration and De-Appointment If D0205 is not received before IF/PUB-003 is sent, then the data fields will not contain the identities of incoming DC and MOA.	DIP Interface
1.2.7	After receiving IF/PUB-003 and MA appointment is confirmed, within 2WD	Transfer Inventory Data	UMSO	Incoming MA	D0388 UMS Inventory	DTN Message
1.2.8	After receiving IF/PUB-003, as per REC Metering Operations Schedule	Issue MTDs	Outgoing MOA	New Supplier Incoming MOA	Skeleton D0150 Non Half-hourly Meter Technical Details (for Smart Meters) D0149 Notification of Mapping Details / D0150 Non Half-hourly Meter Technical Details (for Traditional Meters) D0268 Half Hourly Meter Technical Details and where applicable D0383 Notification of Commissioning Information / D0384 Notification of Commissioning Status (for Advanced Meters)	DTN Interface
1.2.9	Following 3.3.3 within 5WD, if IF/PUB-003 does not contain details of incoming MOA	Request incoming MOA to share details with outgoing MOA	New Supplier	Incoming MOA		Bilaterally Agreed
1.2.10	Following 3.3.9, as per REC Metering Operations Schedule	Share incoming MOA and Data Collector appointment details	Incoming MOA	Outgoing MOA		Bilaterally Agreed
1.2.11	When CoS secured	Receive Secured Active	CSS	SMRA
1.2.12	Following 3.3.10, as per REC Metering Operations Schedule	Process MTDs and send to Data Collector	Incoming MOA	Incoming Data Collector	D0149 Notification of Mapping Details / D0150 Non Half hourly Meter Technical Details Or D0268 Half Hourly Meter Technical Details and where applicable D0383 Notification of Commissioning Information / D0384 Notification of Commissioning Status (for Advanced Meters)	Bilaterally Agreed
1.2.13	On receiving skeleton D0150, within 2WD	Send Smart Meter configuration details	New Supplier	Incoming MOA	D0367 Smart Meter Configuration Details	DTN Interface
1.2.14	Following receipt of D0150 & D0367 or D0268, as per REC Metering Operations Schedule	Share MTDs	Incoming MOA	New Supplier Incoming DC LDSO	D0149 Notification of Mapping Details / D0150 Non Half-hourly Meter Technical Details / D0268 Half Hourly Meter Technical Details and where applicable D0383 Notification of Commissioning Information / D0384 Notification of Commissioning Status (for Advanced Meters)	DTN interface
1.2.15	In parallel with 3.3.13 for Traditional Meters	Attempt CoS read via customer own read and share with Old Supplier	New Supplier	Old Supplier	D0010 Meter Readings	DTN Message
1.2.16	Following 3.3.14 for NHH Advanced Meters	Remotely retrieve reading and share	Incoming NHHDC	LDSO New Supplier	D0010 Meter Readings And [Supplier only] D0019 Metering System EAC/AA Data	DTN Message
1.2.17	In parallel with 3.3.14 for HH Advanced Meters	Start collecting data from start of appointment period	Incoming HHDC			Internal Process
1.2.18	Within 2WD of 3.3.6 for Smart Meters	Take reading from Daily Read Log and share. If Meter is not communicating, then cumulative register reading should be estimated and shared.	Outgoing SDS	Old Supplier LDSO	IF/PUB-041 Smart/Advanced Readings	DIP Interface
1.2.19	Within 5 days of CoS	Validate and re-share CoS Read. If CoS Read was not received, then create CoS Read and share.	Old Supplier	Outgoing Data Service (except for Smart Meters) New Supplier	D0010 Meter Readings	DTN Message
1.2.20	On receipt of D0010 from Old Supplier	Close out Settlements to Effective to Date	Outgoing Data Service			Internal Process
1.2.21	On receipt of D0010 from Old Supplier	Share with DC	New Supplier	Incoming Data Collector	D0010 Meter Readings	DTN Message
1.2.22	On receipt of D0010 from New Supplier	Send initial reads to LDSO	Incoming Data Collector	LDSO New Supplier	D0086 Notification of Change of Supplier Readings D0019 Metering System EAC/AA Data Or, for HH Metering Systems: D0036 Validated Half Hourly Advances for Inclusion in Aggregated Supplier Matrix / D00275 Validated Half Hourly Advances	DTN Message

CONTENTS

Reverse Migration V1.0

Defined Terms

Cross-references