I have a few many-to-many relationships in my CDS model. Two of them come from a separate system through the Gateway (read only).
I cannot use the Combo box on a Form to have multiple selected items. It does not work.
When will this be addressed? Is it on the roadmap?
@powerappsdev8, I also needed many to many relationships for my Power App. I wrote a blogpost about it: http://inspiribytes.com/power-apps/canvas-power-app-many-to-many-relationships-in-teams-project-oakd...
The blogpost is about the new light CDS in Teams (new project Oakdale) but I assume the workaround also works for CDS.
I hope it's useful for you 🙂