I have a master called Site, each site has various children like the pic below.
It is possible that when adding a new child to automatically select the master id? I tried to follow a thread example here Add Detail record in Master Detail form but I'm battling to get the correct values to match. I have Site (with rID) then SiteContact would have its SiteID set to the Site rID. how would I formulate the expression to select the master (Site with rID)