View definitions in VFP are independent of each other. If one view references another, the second view is executed and the result is used as if it were a table. Unless you include a GROUP BY in the second view, also, you wouldn't see grouped data. Keep in mind that a UNION contains an implicit DISTINCT operation which in turn does an implicit ORDER BY on every field. Compare the results of the following two queries to see what I mean:

SELECT Type, id FROM SYS(2005)
SELECT Type, id FROM SYS(2005) UNION SELECT Type, id FROM SYS(2005)