i was looking a long time for a solution i hope, someone can help me (before i despair )
Please take a look at this page:
The attribute “Schnittstelle” (Interface) is multi select - e.g. some products in this category can have an RS232 AND USB interface. Same with other attributes - but i use this one for my explanation.
If i click RS232 and USB, all products are shown, that have either RS232 OR USB. Now i want to filter like: show me all products with interface (both) USB AND RS232.
Is this possible? Every tip would be very helpful!