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Dear Umar Thanks for your reply well i am gonna look into that auto line constraint i.e. what it does. but i resolved the issue some other way around. this is what happened. 1. When i selected all shell objects to mesh them. it so happened that etabs also selected the slab in which i had marked opening. and after the meshing was done etabs subdivided the opening too. 2. when i selected all shell objects to apply loads etabs selected the opening too and applied load on it as well. so when i ran the model check i found the slab label in which problem was present and well it was the opening and etabs could not transfer the load there. so that was the problem. Solution : i deleted the subdivided (Meshed) opening therefore the load applied on it was also gone. then i created the new opening. and there is not warning now.. Thank you again for replying