在你的postopen事件中写:
Dim response As NotesDocument
Dim parent As NotesDocument
Dim parentUnid As String
Set response=Source.Document
parentUnid = response.ParentDocumentUNID
If ( parentUnid = "" ) Then
Messagebox( "This document has no parent." )
Exit Sub
End If
Set parent = db.GetDocumentByUNID(parentUnid)