in my view I have 3 exposed filters based on different vocabularies. My need is to use only one filter at a time, when a value is selected in one filter the two others have to be automatically reset (to "-any-"), I googled and I only found one similar question but the answer (expose reset button) doesn't really fit my need. I suspect there must be one simple solution to this common (I guess) requirement. I'm using BEF but no help from this side I fear. Thank you for helping ! EDIT : I put my three filters in a group using AND operator
This is not a common requirement but anyway.
If you really need that functionality you can do this using js (or jquery) so when changes a select option (assuming you are using select element) to reset the other 2 selects to the -Any- option.
Check this question change selects value onchange of another select based to the change() jquery function.