I have been given a model which uses Cell Periodicity to model a unit cell representing a large repetitive structure. Periodic boundary conditions are used on the outer boundaries of this unit cell. When I run the model however, I get this message: Boundary similarity and source/destination incompatibility Where source and destination are defined - not sure what it means? This is where "Boundary similarity: src2dst_bp3_cp1_sim5" are defined. I have selected it in the model to the right. Anyone more experienced than me who might have an idea of whats going on?