The foundation system is formed with a continuous foundation on 3 sides and a raft slab edge on one side. This basic system is not suitable for the program algorithm. You can create the foundation system as a beamless raft foundation as in the example. In the example project, only the min thickness warning is given because the distance between the columns is too large. If desired, the "clear opening value for thickness control" can be intervened in both directions with the Reinforced Concrete calculation edit command.