I would setup the Attributes as follow:
RegKey: Key, Required
RegEntry: Key, Required
RegValue: (NOT Key, NOT Required)
Don't forget to set the Length of RegValue to fit the lengthy values.
Example of an inventory would be:
RegKey: HKLM\Software\Test
RegEntry: Environment
RegValue: Production
Also have in mind to take care of the "default" entry (name) as it's "blank".