How are you passing supervisor information via your hire integrations?

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HI there!  Would appreciate any feedback you may have.  At Quintiles we have been live with new hire integration from Taleo to PSHR for over 6 years now.  Up to now we have always had a free text UDF on the offer record where the new employee's supervisor id (PS emplid) is entered.  As mentioned, this is a free text field with no validation and while not a huge source of pain, we would like to look at potential solutions for building a more secure solution for capturing this information.  Keep in mind, the hiring manager on the requisition is