The two-way deck is associated with a rigid diaphragm in RAM Frame. The out-of-plane stiffness of two-way decks is ignored when analyzing lateral load case in RAM Frame when the diaphragm is rigid. The out-of-plane stiffness is critical for transfer conditions. If it is ignored, then there is not load path for lateral load to be transferred into the two-way slab and into the other frame elements supporting the floor. Out-of-plane stiffness is considered when the diaphragm is set to semirigid. Using semirigid diaphragms will resolve the problem. See the frequently asked question on two-way decks on the following web page for more discussion on this: