Filter not working in WebAccess

Hi,

I'm creating a new change process for my new director and am having problems with a filter in a User collection on my main window.

Basically, we want it so that we first select the Group, and when you select the user dropdown it only shows members of the previously selected group.

I've created a filter on the User relationship on the relevant BO and it is working really well in Console.

But I can't get it to work in WebDesk, where the User list is still listing all users.

I've tried adding it via Window Designed as well.

Restarted IIS upmteen times.

What am I missing?

Cheers - Adam.