In order to introduce the Single Electricity Market there are a number of changes required to the existing Retail Market processes.

This MCR relates to the Market Process surrounding a change of change of SSAC and/or Supplier Unit .

The reasons for the change are two fold:-

• A Supplier Unit ID entity has been added to the Data Model and will be required within Change of Supplier Unit / SSAC processing

• Additional validation rules and processing will be required surrounding Trading Sites

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