When I select from FMIOI using one fund (FONDS) and one fund center (FISTL) (let's call it fund center 1), I get results very quickly (within seconds). If I use the same fund and a different fund center (let's call it fund center 2), I still get results back quickly. But if I use the same fund as above and both fund centers 1 and 2 as selection criteria, it takes a long time to get results back. I see this behavior in both my custom program and when using SE16. Can anyone explain why selecting from FMIOI with two fund centers causes such a performance problem when individually the fund centers return with no problem?