Hello, I have a project consisting of the floor, the 1st and the 2nd floor, with a 1 m sub-floor curtain on the raft slab. When I say "analyze the system", a warning message comes first: "more than one diaphragm is detected in the floors below" and "resolve the system with more than one diaphragm" does not cause any problems. B2 irregularities occur on the 1st floor, which is quite close to 50. I deleted the raft floor and recreated it, but I could not solve the problem. Where could the problem come from? I need to solve this project with a single aperture. I can't send the file, the size is big.. I would appreciate it if you reply as soon as possible..