Shared reminders-no alert-pointless!

If I add a reminder to the list, it shows up on who I am sharing it with (my partner-on his ipad) however the notification for the reminder will not popup-it will on whoever creates it and vice versa. The same occurs if he creates a reminder. It shows up in both of our Reminders list, but only popups for the person who created the reminder. Is there a fix or work-around for this?

Am I missing something?

Thanks.