diff --git a/data/SSC-01/SSC-01-01/SSC-01-01.al.owl.ttl b/data/SSC-01/SSC-01-01/SSC-01-01.al.owl.ttl
index b3e2012e5e83c88d2f2003436b9ae28bb9b36ae2..fc3297dfdc0dd73565b549dc379fe77ef8e86cdc 100644
--- a/data/SSC-01/SSC-01-01/SSC-01-01.al.owl.ttl
+++ b/data/SSC-01/SSC-01-01/SSC-01-01.al.owl.ttl
@@ -16,7 +16,7 @@
 	a owl:ObjectProperty ;
 	owl:inverseOf :part-of .
 
-:manner a owl:ObjectProperty .
+:manner a owl:DatatypeProperty .
 
 
 # ::comment "The Solar System is the gravitationally bound system ..."
@@ -98,15 +98,18 @@
 
 :direct-orbit a owl:ObjectProperty ;
 	rdfs:subPropertyOf :orbit ;
-	:manner :direct .
+	:manner "direct" .
 
 :indirect-orbit a owl:ObjectProperty ;
 	rdfs:subPropertyOf :orbit ;
-	:manner :indirect .
-
-:direct a owl:ObjectProperty .
-
-:indirect
-	a owl:ObjectProperty ;
-	owl:inverseOf :part-of .
+	:manner "not-direct" .
+
+[ rdf:type owl:Restriction ;
+  owl:onProperty :manner ;
+  owl:hasValue "direct" ;
+  owl:disjointWith [ rdf:type owl:Restriction ;
+                     owl:onProperty :manner ;
+                     owl:hasValue "not-direct"
+                   ]
+] .