Problem with Wall Finishing

In ArchiCAD 17, we have to think, as builders, although changing the priority that can make a cut to another material, it is also necessary to consider that materials with a low priority are mostly finishing materials, the factors of (other - Finish - core) - are contained within the parameters of the composite structure and complex profiles. Constructive logic applies when using composite structures, so if we make the slab in the limit of the composite wall, it becomes impossible to finish, cover edge of slab, however if you build on the border of the core of the wall resulting behave realistically.