The limitation by using rules in layouts should be elimiated since it limits the use of quick layout massively. In our case we calculate a %-KPI which can not be safed in a cube and must be calculated on the fly. Using the quick layout and having the rule set on the cube not only leads to not calclulated KPI´s but also leads to totally wrong numbers if requirements described in manually are not 100% met.
Since this is nothing you can easily train your users but on the other hand can lead to wrong figures if not treated correctly, the limitiation should be eliminated.
