That's because MAS90 is actually now technologically ahead of MAS500. Since it's moved to a somewhat of a 'service oriented architecture' (not true one, but far better than hard coded mas500, VI is able to import data as if its keyed in. Not so much with MAS500 which means, even with API's there is no guarantee you'll get the same result as keying it in since its a different code base and different bugs.