i was trying to rebuild your example for "NestedMailMerge".
My data structure is defined like this example:
Public Class ReportClass
Public Property Name As String
Public Property Reports As New List(Of ReportClassSublist)
Public Class ReportClassSublist
Public Property Subinformation1 As String
Public Property SubInteger2 As Integer
the code of my base class
Dim nestedList As New List(Of ReportClass)
Dim nestedTable As MailMergeDataTable = New MailMergeDataTable("Report", nestedList)
this last line is throwing the following exception: Group "Reports" is missing in the source document.
This seems to be an error in my data structure, analiyzing the nestedTable i can see, that the Proerty Reports is Nothing.