Candidate Feeds into Taleo

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I would like to be able to feed in Candidates into TCC from our PeopleSoft instance as a net-change.  So if the candidate id is null on the data i am sending that it will create a Candidate ID on the fly.  I have not been able to get this to work as a net-change or as a merge it complains about not being able to create or update the Candidate ID field.

Have any of y'all run across this???

Most folks seem to have their Candidate feeds done as a one time cutover feed and then expect ALL hires to come through Taleo so the Candidate ID would exist on an update file to TCC.  This is not going to work for us because sometimes Recruiting would like to enter a hire quickly into PeopleSoft and have it feed back to Taleo as an Internal Candidate.