5.13 Fields Used to Identify Various Kinds of Notes  ↑

5.13.1 Type

The word Type can be used as a label, but is not a valid field type.

A field called Type can often be a useful element of a Collection.

The label Type can often be usefully combined with a type of Pick From in order to predefine allowable types that make sense within the context of a particular Collection.

BTW, if you choose to sort your Collection by one of the options that includes Class, then Notenik will use an available Type value in place of a Class value, if the Collection does not define a field of type Class.