AutoCAD .NET :: Multiply Owned Object

I have a function that clones drawing layouts from a source drawing to a current working (target) drawing. This function is causing a  *Warning* Multiply owned object, handle "F4" warning after the layout is cloned and the target drawing saved. Since I've audit and recovered the target drawing and found no errors, this warning is just annoying.

Here's the

Public Function ImportLayout(ByVal filename As String, ByVal layoutname As String) As ObjectId
Dim idLayout As ObjectId = ObjectId.Null
Dim doc As Document = ApplicationServices.Application.DocumentManager.MdiActiveDocument
Dim ed As Editor = doc.Editor
[code]..........