CopyAllItems causing problem with permissions

Hi,
It's been a while since I posted in here but I have an odd problem that I'm hoping someone can help me with.
I have a function in a script library which creates a new copy of my existing document. The document is a person record in an HR system and in the event that their position changes I want to create an archive copy of their old HR document.

Although the code works the new document can't be read or even seen by me. I can see it if I run Notes on the server and access the database that way. I do have Readers and Authors fields on the original document (Employee) and the archived copy (Employee Position). These fields still exist on the EP document and look to be correct but in fact their type has changed from Text List to Text.

Why does this happen ? What's the best way to copy a multivalue Authors field from one document to another ?

Code to do the copy is here:
Public Function CreateEPR As Integer
      
      Dim workspace As New NotesUIWorkspace
      Dim uidoc As NotesUIDocument
      Dim doc As NotesDocument
      Dim currentdoc As NotesDocument
      Dim db As NotesDatabase
      Dim session As New NotesSession
      
      Set db = session.CurrentDatabase
      Set doc = New NotesDocument(db)
      Set uidoc = workspace.CurrentDocument
      Set currentdoc = uidoc.Document
      
      currentdoc.CopyAllItems doc, False
      doc.Form="Employee Position"
      
      Call doc.Save (True,True)
      
End Function

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