Stop data entry if certain criteria exists

I have a time reporting database that has a form with a start and stop time.

When the employee selects their name from a combo box and if they haven't entered a stop time in their previous transaction I have a message box appearing.  But the problem is, the message box is appearing for any employee even if they don't have "un-ended" transactions.

Here is my code.  Can someone spot the problem for me?

    If IsNull(DMax("[StopTime]", "tblLaborTranx", "[EmployeeID] = " & Forms!frmEmployeeLaborTranx!txtEmployeeID)) Then
        MsgBox "You have not logged out of your last labor transaction. Please be sure to log out of it or see the front office for editing."
        DoCmd.Close acForm, "frmEmployeeLaborTranx", acSaveNo
        Exit Sub
    End If

I also have tried:

    If DMax("[StopTime]", "tblLaborTranx", "[EmployeeID] = " & Forms!frmEmployeeLaborTranx!txtEmployeeID) = "" Then
        MsgBox "You have not logged out of your last labor transaction. Please be sure to log out of it or see the front office for editing."
        DoCmd.Close acForm, "frmEmployeeLaborTranx", acSaveNo
        Exit Sub
    End If

But that doesn't work either.

--Steve
SteveL13Asked:
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Scott McDaniel (Microsoft Access MVP - EE MVE )Connect With a Mentor Infotrakker SoftwareCommented:
Your DMAX statement just gets the record with the maximum value in StopTime for a specific employee, so it will almost always return a record (at least I'd think).

Instead, you want to determine if a user has not "logged out" of their last activity? If so, how do you determine when the user has logged out - for example, if I look at the table, how would I know that user has logged out of a specific transaction?

Do you store the "Activity" Stop and Start time in the same record? If so, you could look for any record with a NULL or Empty value in Stop:

Dim rst As DAO.Recordset
Set rst = Currentdb.OpenRecordset("SELECT * FROM tblLaborTranx WHERE (StopTime IS NULL OR StopTime=0) And EmployeeID=" & Forms!frmEmployeeLaborTranx!txtEmployeeID)

If Not (rst.EOF and rst.BOF) Then
  '/ one or more entries do not have a Stop time
  Msgbox "blah blah"
End If

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I'm not sure of the datatype for StopTime, so you may need to check it differently.
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