>
>The view has a buffermode of 5. The underlying table has a buffermode of 1.

Do you have both the view and the underlying table open in the dataenvironment? If so, you are experiencing a double buffering issue. When you issuer a TABLEUPDATE() on the view, and its base table is open in the same DS, you are really just writing changes to that table, which is also buffered, not to the base tables. To get the Changes all the way down, you have to TABLEUPDATE the view, and then TABLEUPDATE the underlying table.

FWIW, it is not necessary to open a view's underlying tables for it in the DE, the view takes care of this itself.