Need to assign an element IDs to a room parameter

Revit
1

I am trying to track rooms from a linked project file in my host project by assigning the linked file rooms element ID to a parameter in each new room. I only get the first element ID assigned to all of the new rooms LinkElementID parameter. I can’t get dynamo to process the list.

Room
Room2240×1062 218 KB

2

You have to make your list structures match. Right now you have element as an L3 list and value as an L2 list.

3

Thanks. List Flatten did the trick.