Two Repeting group superimposed with a reusable element

I need a help for my use case,
I have two ReptingGroup, into each other for better scalability.

The problem is that i have a reusubale element which allows to have a flotingGroup in this repeatingGroup. I want when I select an item in my floatingGroup that I can change the data in my Database. I want to know how one can display data to to reusable element. Because the display data does not work.