I received the PM you sent, but unfortunately, I cannot open your database since I do not have Access 2007/2010 here at work. From your description it sounds like you do not want anyone to be able to add a new record if they scroll past the last record. I have used the following code in the on current event of the form which detects if a new record is attempted and forces Access to go back to the first record. Hopefully this will help
Code:
Private Sub Form_Current()
If Me.NewRecord Then
MsgBox "You are not permitted to add a new record via this form"
DoCmd.GoToRecord , , acFirst
End If
End Sub