In order to accurately calculate load history deflections, RAM Concept needs each element containing significant forces to be covered by the tributary of a design strip cross section or design section tributary. In order to make sure the user hasn’t forgotten to define strips over a large portion of the slab, RAM Concept performs some rudimentary checks to make sure a large portion of the slab is covered by cross section tributaries in two perpendicular directions. This warning can be safely ignored in one-way slab regions where the spanning direction is appropriately covered by cross sections.