Hi @rob_marshall, Great explanation, thank you. Yes our lists contain multiple subset lists but the list properties are just being used for LOOKUPs and SUMs. They're not being referenced directly by the module in line items or 'double counting' as you cleverly called it, so in this case is the Model still more bloated than if we were to separate the list properties out to SYS modules? (I understand the other benefits of having system modules i.e. auditability, filtering, formula usability etc.) Kind Regards, Michael
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