How do we populate field 'EnergyAccountType' for GB Power Trades submitted to CMS?

How do we populate field 'EnergyAccountType' for GB Power Trades submitted to CMS?

The eCM Standard suggests that field 'EnergyAccountType' is a mandatory field for all GB Power trades, and can be determined using 'Definitions within the Balancing & Settlement Code for the UK electricity market'.

Field 'EnergyAccountType' should be populated with either 'Production' or 'Consumption'.

The Elexon website (below) provides information about 'Balancing Mechanism Units', and provides a link to a document named 'Production/Consumption Status and Flag'.