Since a couple of years codeunits have a property called Subtype. Selecting a specific value for this property changes the behavior of the codeunit, one of them being an extra property added to functions, i.e. FunctionType (for Test Codeunits and Upgrade Codeunits) which defaults to a specific value depending on the Subtype value (see my post NAV 2015 Glance 4: New Functions are Local by Default?).
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