Index: resources/data/validator/combinations.mapcss
===================================================================
--- resources/data/validator/combinations.mapcss	(révision 16853)
+++ resources/data/validator/combinations.mapcss	(copie de travail)
@@ -233,7 +233,7 @@
 }
 
 /* {0.key} without {1.key}, {2.key} or {3.tag}, #17255 */
-way[incline                    ][!highway][!railway][aeroway!~/^(runway|taxiway)$/][attraction!=summer_toboggan],
+way[incline                    ][!highway][!railway][aeroway!~/^(runway|taxiway)$/][attraction!=summer_toboggan][leisure!=slipway],
 *[toll                         ][!highway][!barrier][route!~/^(ferry|road)$/] {
   throwWarning: tr("{0} without {1}, {2} or {3}", "{0.key}", "{1.key}", "{2.key}", "{3.tag}");
   group: tr("missing tag");
@@ -805,4 +805,4 @@
   assertMatch: "way highway=primary placement=left_of:2 placement:forward=right_of:1";
   assertNoMatch: "way highway=primary placement:forward=right_of:1";
   assertNoMatch: "way highway=primary placement:forward=transition placement:both_ways=transition";
-}
\ No newline at end of file
+}