Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 14800)
+++ trunk/data/validator/combinations.mapcss	(revision 14808)
@@ -253,4 +253,10 @@
 }
 
+/* {0.tag} together with {1.tag} (error level) */
+relation[type=multipolygon][area=no] {
+  throwError: tr("{0} together with {1}", "{0.tag}", "{1.tag}");
+  group: tr("suspicious tag combination");
+}
+
 /* {0.key} together with {1.key} (info level) */
 *[addr:street][addr:place] {