Type Mismatch Error

I have a series of three cascading combo boxes that have been working as
desired for months. All of a sudden, there is one set of choices in the third
combo box (cboDescription) that is triggering a "Run time error 13 -- Type
mismatch" error. All other choices work fine. When I click Debug, it
highlights the first line of the following code, which fills in a control
(Identifier) once a selection is made in cboDescription. (I have added a
requery of Identifier after this code, because at times the Identifier
control does not change if I make different selections in the combo box
series.

cboDescription After Update Event
If Not IsNull(Me(DescriptionID)) Then
Me![Identifier] = [TicketNum] & " - " & [State] _
& " - " & [ReceivedDate] & " - " & [DescriptionText]
End If

Me![Identifier].Requery

I have decompiled, compacted, and recompiled this database several times.
Does anyone have any thoughts on this problelm?
--
susan
.

Relevant Pages

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