FilterOverrides
You can either override an existing filter definition from the report or define a new filter definition. Any definition given in the FilterOverrides with the same FieldRef as a filter from the underlying report will replace that filter at run time.
For example, all of the following changes could be safely made without altering the underlying SQL:
Choose a different AutoCompleteQuery/ModelPicker for a filter.
Make a filter required which was previously optional.
Hide an optional filter which doesn’t make sense to the current user.
Change the list of enumerated values shown for a drop-down selection.
Removal of Filter fields is not supported.