Question-and-Answer Resource for the Building Energy Modeling Community
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This is an OpenStudio bug or at least a missing feature. I'd say bug because we are showing you all of the defrost options even though you don't have the supporting fields to use them all. From the IO Ref on the "Defrost Energy Correction Curve Name" field.
"The defrost energy correction curve name is used only for the Electric with Temperature Termination, Hot-Gas with Temperature Termination, and Hot-Brine with Temperature Termination case defrost types."
You don't have access to this field through the App so you can't use these options. I filed a bug here
Behind the scenes OS does support all of this though, so you could modify the hvac library with a ReferigerationCase instance with the parameters you need. It is a little advanced but I outlined the process for adding other types of objects here
