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Try assigning target.{GT1(1):GuarantorPhNumHome}  to empty string - without the parens

Thank you! 

I just added another property to the request object class holding the HL7 data to contain an instance of the Header object populated with the auth value I received in the first step.

Then a quick edit to the operation class method I needed to call and adding the line:

Do ..Adapter.%Client.HeadersOut.SetAt(pRequest.AccessAuth,1)