Ticket #21268: josm_21268_v2.patch

resources/data/validator/ignoretags.cfg

@@ -702 +702 @@
 E:building:roof:shape
 K:landuse=school
 E:role
+E:levels
 ;
 ; Tags not yet decided (to remove from this section when added or moved up when deprecated) 
 ; see josm tickets: 17770 15309 15774 16315 16658 16793 19982

resources/data/validator/deprecated.mapcss

@@ -503 +503 @@
   fixAdd: "mooring=yes";
 }
 
-/* #10837 */
+/* #10837, #21268 */
 *[building][levels],
-*[building:part=yes][levels] {
+*[building:part][levels] {
   throwWarning: tr("{0} is deprecated", "{1.key}");
   suggestAlternative: "building:levels";
   group: tr("deprecated tagging");
   fixChangeKey: "levels => building:levels";
+  set levels_building;
+}
+*[levels]!.levels_building {
+  throwWarning: tr("Unusual key {0}, maybe {1} or {2} is meant", "{0.key}", "level", "building:levels");
 }
 
 /* #10691 */