Index: trunk/data/validator/geometry.mapcss
===================================================================
--- trunk/data/validator/geometry.mapcss	(revision 7106)
+++ trunk/data/validator/geometry.mapcss	(revision 7164)
@@ -13,5 +13,5 @@
 
 /* Building inside building (spatial test) */
-*[building][building!~/no|entrance/][coalesce(tag("layer"),"0") = coalesce(parent_tag("layer"),"0")] ∈
+*[building][building!~/no|entrance/][any(tag("layer"),"0") = any(parent_tag("layer"),"0")] ∈
 *[building][building!~/no|entrance/] {
   throwWarning: tr("Building inside building");