It seems that if the length of the entry in the field is greater than 10
characters you want to cancel the entry. Why not just limit the field size
to 10 characters? Anyhow, if you want to remove the entry you need to add:
Me.txtMasterField.Undo

Anatoly Kurilin wrote:
To make the investigation easier, I've changed the code but of no avail ...

Private Sub txtMasterField_BeforeUpdate(Cancel As Integer)

If Len(txtMasterField.Value) 10 Then
Beep
Cancel = True
End If

End Sub

OK, what is gCustomerInitials? Seems to be a user-defined function, but
what
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