Transitions ProcessSubject update - not working

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Hello All,

I am trying to update some UDFs in Transitions ProcessSubject and I keep getting the below error.  There does not look to be a field in the ProcessSubject root to join on so I was joining down to the Candidate,Number under the Profile and it does not seem to work.  I have tried "Number" to join on but it does not look to have a hidden Number field on this entity.

No import operations are available for the ProcessSubject entity.;

Have any of you had luck updating UDFs here?

Thanks!

Greg