Yes, I confirm that. The new client does appear in the combo box.  I just
cannot do anything with it unless and until I close the form it is on and
reopen it.  Then I can select the new client.

All I am trying to do is -- upon closing my detail entry form return to the
main form at the record of the new client.   I have assumed because of the
aforementioned behavior that my issue was requery.  I further assumed once I
understood why I could not requery the combo box without an error 2118 about
saving first that I would be able to load some code in the closing routine of
the detail entry form to select the new client's record for the main form.  

Main client form not in list code:
Private Sub cboClient_NotInList(NewData As String, response As Integer)
Dim Result
Dim msg As String
Dim CR As String

CR = Chr$(13)
' Exit this subroutine if the combo box was cleared.
If NewData = "" Then Exit Sub
NewData = UCase(NewData)

' Ask the user if he or she wishes to add the new client.
 msg = "'" & NewData & "' is not in the list." & CR & CR
 msg = msg & "Do you want to add this new client?"
   
If MsgBox(msg, vbQuestion + vbYesNo + vbDefaultButton2) = vbYes Then
       ' If the user chose Yes, start the NewClient form in data entry mode
as a dialog form,
       ' passing the new client id in NewData to the OpenForm method's
OpenArgs argument. The
       ' OpenArgs argument is used in client form's Form_Load event
procedure.
         DoCmd.OpenForm "frm1 ClientEntry", , , , acAdd, acDialog, NewData
End If

' Look for the client the user created in the NewClient form.
Result = DLookup("[ClientID]", "tbl 1 CLIENT", "[ClientID]='" & NewData & "'")

If IsNull(Result) Then
         ' If the client was not created, set the Response argument to
suppress an error
         ' message and undo changes.
         response = acDataErrContinue
         MsgBox "The client record WAS NOT created."
Else
       ' If the client was created, set the Response argument to indicate
that new data
       ' is being added.
       response = acDataErrAdded
       MsgBox "The client record WAS created"
End If
End Sub

Client entry form closing code (command button):
Private Sub btnCloseForm_Click()
         DoCmd.Close
End Sub

I removed all the code from the closing button to start over; I was going in
twelve different directions.  

Thanks for the help.  I've managed to get it done.