Hi Amina - If you perform this search:
[have] [id] [equals] GO:0051704 [Descendant] [any type]
you get 4 results:
GO:0008150 biological_process
GO:0009987 cellular process
GO:0051704 multi-organism process
GO:0032501 multicellular organismal process
This is okay I think, although the last 3 results are related to GO:0051704 via disjoint_from. However, I tried changing the 'via relationship' menu to 'is_a' and I still got these 4 results - I would expect to get just GO:0008150 (biological_process). In fact it doesn't seem to matter what relationship type is chosen, you still get the same 4 results which might suggest that this menu is being ignored.
This also works with the reasoner on, so will close - see other item:
https://sourceforge.net/tracker2/?func=detail&aid=2561035&group_id=36855&atid=418257