[AccessD] Combo Box Problem

I have one value in a combo box that will not work correctly.  The hidden
column 1 is a customer number.  The visible column 2 is [CustomerNUmber] &
"; " & [CustomerName].  If I type the customer number and tab, I get a value
not in list error.  If I use a different customer number and tab, the value
saves.  If I expose column 1 then this customer number is saved.  If I
select the customer using a mouse, the value saves.

I cannot find any differences in this value with any other record in my
table, so I am at a loss to explain what this one value is doing.  

This is an XP database with a SQL 2000 back end connected through linked
tables.

Debbie
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