First, from a programming point of view, forget logicals exist. Your selects should be over the physical file. DB2 will use a logical if it makes sense, they're simply performance enhancements.
As to your problem, you say the logical has a 3-part key, but is it unique? And if so, is it actually tagged that way in the system, or is it just that you "know" it's unique. The theory says you must have a unique key to each row in a table, now perhaps customer, invoice# and date are unique (I'd think just invoice# was unique) but you have to have told the system they're unique.
Also, personally I'd lose the whole data adapter stuff and do your own updates, but that's just me.
-Walden
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