Editing Loot Table Namespace, Type, and Registry after it has been saved.

There's this problem I'll run into everytime I make the first Loot Table for my mod. I go and add all the pools and entries, and then I do a quick save just incase anything happens. But then I find out when it is first saved, all the input boxes get locked into not being able to be edited/changed. I would love to know if this is a problem on myside, or if it's something that can't be changed.