What is the name of the violating unique index constraint in dao / ms-access

I am trying to insert a record into a table with DAO (within MS-开发者_如何学GoAccess) and doing so, I receive an Error 3022 (which indicates that a unique index is violated). The error is correct since in fact the tried-to-insert record has a value which is already found in the table.

Now, I'd like to find out the name of the violated unique index. Does someone have a clue how I'd get this?

Thanks for any pointer René

Here are some notes:

Sub WithADO()
''Reference: Microsoft ADO Ext x.x For DLL and Security
Dim catTables As ADOX.Catalog
Dim cn As ADODB.Connection
Dim ndx As Object

Set catTables = CreateObject("ADOX.Catalog")

Set cn = CreateObject("ADODB.Connection")
dbfile = "C:\Docs\LTD.mdb"

    cn.Open "Provider=Microsoft.Jet.OLEDB.4.0;" & _
              "Data Source=" & dbfile & ";"

Set catTables.ActiveConnection = cn

For Each ndx In catTables.Tables("Table1").Indexes
    strlist = ndx.Name & " " & ndx.Properties("Primary Key") & vbCrLf & strlist
Next
MsgBox strlist

Set catTables = Nothing

End Sub

Sub WithDAO()
''Reference: Microsoft DAO x.x Object Library
Dim db As DAO.Database
Dim tdf As TableDef
Dim ndx As Object

Set db = CurrentDb
Set tdf = db.TableDefs("Table1")

For Each ndx In tdf.Indexes

    If ndx.Primary = True Then
        MsgBox ndx.Name
    End If
Next
End Sub

You could also use schemas.