The 595 Market Message was baselined within the Market Schema at version 6.0, as detailed within MCR 112 v1.1, as part of the suite of changes to the Retail Market Design to satisfy new requirements of SEM implementation.

An alternative approach to MCR063 was presented to the IGG on February 1^{st 2007 which included the addition of the following 3 fields to the 595 Market Message in relation to the QH import validation:}

• Count of MPRN(Existing field within the 591 MM)

• Percentage of MPRNs Estimated (New Field)

• Percentage of Consumption Actual (New Field)

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