Hi, 

I would like to create a page to view the project ID, Part No and the state of routings and product structure. I already did it as a datasource and elements in a Lobby (see below)

My purpose now is to create a new page configuration. Entity association and the key mapping is working good between Project and Routings. But between Project/Routing and Product Structure it is impossible. Entity Key are not poping in the Key Mapping List (see below)

Even if the Entity PART_NO is existing in ProdStrucAlternate. The matching is working on a lobby but not in a projection. Could you please help me how to activate those entities in Product Structre alternate ?