Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 7487)
+++ trunk/data/validator/combinations.mapcss	(revision 7488)
@@ -173,2 +173,9 @@
   throwWarning: tr("{0} without {1} or {2}", "{0.key}", "{1.key}", "{2.key}");
 }
+
+/* see #10471 */
+way[waterway] > node[ford?] { set ford_on_waterway; }
+way[highway] > node[ford?] { set ford_on_highway; }
+node[ford?]!.ford_on_waterway, node[ford?]!.ford_on_highway {
+    throwWarning: tr("{0} should be on the node where {1} and {2} intersect", "ford", "highway", "waterway");
+}