MCR 0140 – Clarifications regarding the 591 MM

The 591 Market Message was baselined at version 6.0 as part of the suite of changes to the Retail Market Design to satisfy new requirements of SEM implementation. The following statement will be true for the composition of the 591 Market Message

Invalid Combinations should not be populated in the message, however if there are no MPRNs registered for a valid combination then a count of zero should be populated in the message

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