Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 15166)
+++ trunk/data/validator/combinations.mapcss	(revision 15169)
@@ -592,2 +592,8 @@
   group: tr("suspicious tag combination");
 }
+
+/* #17804 */
+area[cemetery=sector][landuse=cemetery] {
+  throwWarning: tr("{0} together with {1}", "{0.tag}", "{1.tag}");
+  group: tr("suspicious tag combination");
+}