I have a question regarding Plans. I'm writing a Puppet Plan and in the Plan I have a parameter defined like this:

Enum['value 1','value 2','value 3'] $parameter_name

Now wen I go to the puppet enterprise console > Plans > Run a plan, I can see the parameter but it doesn't have a dropdown with the three values to choose from as I would expect. In the plan metadata I can see the enum with the three values listed, but in the filed itself I can type any value. Do you guys know what I need to do to get a dropdown for a parameter in plans?