diff --git a/ontology/CASE-unstable-2.0.0.ttl b/ontology/CASE-unstable-2.0.0.ttl
index 953f7973..441f2806 100644
--- a/ontology/CASE-unstable-2.0.0.ttl
+++ b/ontology/CASE-unstable-2.0.0.ttl
@@ -1170,14 +1170,10 @@ action:Action
 
 action:Action-disjointWith-Event-shape
 	a sh:NodeShape ;
-	sh:message "action:Action and core:event are disjoint classes."@en ;
-	sh:node [
+	sh:message "action:Action and core:Event are disjoint classes."@en ;
+	sh:not [
 		a sh:NodeShape ;
-		rdfs:comment "This blank node is provided to avoid a SHACL multiple-inheritance issue."@en ;
-		sh:not [
-			a sh:NodeShape ;
-			sh:class core:Event ;
-		] ;
+		sh:class core:Event ;
 	] ;
 	sh:targetClass action:Action ;
 	.
diff --git a/ontology/CASE-unstable.ttl b/ontology/CASE-unstable.ttl
index 7d14b0ab..b51e735a 100644
--- a/ontology/CASE-unstable.ttl
+++ b/ontology/CASE-unstable.ttl
@@ -1170,14 +1170,10 @@ action:Action
 
 action:Action-disjointWith-Event-shape
 	a sh:NodeShape ;
-	sh:message "action:Action and core:event are disjoint classes."@en ;
-	sh:node [
+	sh:message "action:Action and core:Event are disjoint classes."@en ;
+	sh:not [
 		a sh:NodeShape ;
-		rdfs:comment "This blank node is provided to avoid a SHACL multiple-inheritance issue."@en ;
-		sh:not [
-			a sh:NodeShape ;
-			sh:class core:Event ;
-		] ;
+		sh:class core:Event ;
 	] ;
 	sh:targetClass action:Action ;
 	.