Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 17790)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 17923)
@@ -228,5 +228,5 @@
 
 /* {0.key} without {1.key}, {2.tag}, {3.tag} or {4.tag} */
-*[intermittent                 ][!waterway][natural!~/^(water|spring)$/][landuse!~/^(basin|reservoir)$/][ford!=yes],
+*[intermittent                 ][!waterway][natural!~/^(water|spring)$/][landuse!~/^(basin|reservoir)$/][ford!~/^(yes|stepping_stones)$/],
 *[boat                         ][!waterway][natural!=water             ][landuse!~/^(basin|reservoir)$/][ford!=yes] {
   throwWarning: tr("{0} without {1}, {2}, {3} or {4}", "{0.key}", "{1.key}", "{2.tag}", "{3.tag}", "{4.tag}");