Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 18047)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 18050)
@@ -931,6 +931,4 @@
   group: tr("missing tag");
   set missing_piste_difficulty;
-  assertMatch:   "way piste:type=nordic (count(parent_tag("piste:difficulty")) == 0)";
-  assertNoMatch: "way piste:type=nordic (count(parent_tag("piste:difficulty")) == 1)";
   assertNoMatch: "way piste:type=nordic piste:difficulty=easy";
 }
@@ -940,6 +938,4 @@
   group: tr("missing tag");
   set missing_piste_difficulty_both;
-  assertMatch:   "way piste:type=nordic (count(parent_tag("piste:difficulty")) == 0)";
-  assertNoMatch: "way piste:type=nordic (count(parent_tag("piste:difficulty")) == 1)";
   assertNoMatch: "way piste:type=nordic piste:difficulty=easy";
 }