You edit enumerations by right-clicking on any model element in the "model content" window.
The enumeration editing window
The defined enumeration is a class in the model's typesystem.
For example, you can returning a list of the values. This return a collection of ImportColumn Tuples
ImportColumn.allInstances
Converting this to a list of strings for each Enum value (for example to be used in a list on screen)
ImportColumn.allInstances.asString
Select an enum value from the list, then getting the string value from that
ImportColumn.allInstances->select(ic|ic = #JournalName).asString
Getting the value of an Enum tuple
(#JournalName).toString
(note: asString don't work on enum tuples)
Checking if a collection includes a value
You can't user the includes operator on collections of enum. You have to select on the value and check if you get a "hit".
This works;
SysSingleton.SO.ActiveUser.UserModes->select(x|x = #Consultant)->notEmpty
This does not work: SysSingleton.SO.ActiveUser.UserModes->includes(#Consultant)