[AccessD] Write Conflict

...first time I've seen this one

...cbf
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Option Compare Database
Option Explicit

Private Sub cboParticipantType_AfterUpdate()
    ' Force save and refresh records

On Error GoTo HandleErr

    DoCmd.RunCommand acCmdSaveRecord
    Me.Requery

exithere:
    Exit Sub

HandleErr:
    Select Case Err
        Case Else
            MsgBox Err & ": " & Err.Description, vbCritical, _
             "Error in 
Form_frmCompanyEventsSub.cboParticipantType_AfterUpdate"
    End Select
    Resume exithere
    Resume

End Sub

Private Sub Form_Dirty(Cancel As Integer)
        'MsgBox "Record Changed"
    On Error GoTo Form_Dirty_Error

        Parent!txtUpdated = Date   'update the LastUpdated to today's date 
if the form record was changed.
        Parent!txtUpdateBy = Environ("USERNAME")
        Me.Repaint

   On Error GoTo 0
   Exit Sub

Form_Dirty_Error:

    MsgBox "Error " & Err.Number & " (" & Err.Description & ") in procedure 
Form_Dirty of VBA Document Form_frmCompanyEventsSub"

End Sub

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...the Form_Dirty is the new code ...works elsewhere in main forms without 
problems ...but this is a sub and I'm changing field data on the parent.
...I get a Write Conflict dialog box "This record has been changed by 
another user" with three buttons:
 "Save Record" "Copy to Clipboard" "Drop Changes" ...annoying to say the 
least
...any idea why this is happening?

William