Currently, Test Scenario doesn't support an attribute of Enumeration type.
In case of RULE Scenario:
Loading a Data Object with such attribute, will result in Complex Type properties with a nested simple property "declaringClass" of "java.lang.Class" type.
The expected result should be a Simple property of Enum type (in this case: category [java.lang.Enum] )
In case of DMN Scenario:
Currently no impacts