diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/rest/SchemaManager.java b/src/main/java/org/gcube/informationsystem/resourceregistry/rest/SchemaManager.java
index d6b69d8..ce85c4a 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/rest/SchemaManager.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/rest/SchemaManager.java
@@ -4,6 +4,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import javax.ws.rs.Consumes;
 import javax.ws.rs.DefaultValue;
@@ -29,6 +30,7 @@ import org.gcube.informationsystem.resourceregistry.api.rest.httputils.HTTPCall.
 import org.gcube.informationsystem.resourceregistry.er.ERManagementUtility;
 import org.gcube.informationsystem.resourceregistry.schema.SchemaManagement;
 import org.gcube.informationsystem.resourceregistry.schema.SchemaManagementImpl;
+import org.gcube.informationsystem.types.TypeBinder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -74,11 +76,22 @@ public class SchemaManager {
 		logger.info("Requested {} creation with schema {}", type, json);
 		setCalledMethod(HTTPMETHOD.PUT, type);
 		
+		
 		AccessType accessType = null;
+		String firstGotType = null;
 		try {
-			accessType = ERManagementUtility.getBaseAccessType(type);
+			Set<String> superClasses = TypeBinder.deserializeTypeDefinition(json).getSuperClasses();
+			if(superClasses.size()==0) {
+				throw new ResourceRegistryException("No superclasses defined");
+			}
+			for(String superClass : superClasses) {
+				accessType = ERManagementUtility.getBaseAccessType(superClass);
+				break;
+			}
+		} catch (ResourceRegistryException e) {
+			throw e;
 		} catch(Exception e) {
-			String error = String.format("Cannot register %s schema", type);
+			String error = String.format("Cannot register %s schema. Superclass %s not found", type, firstGotType);
 			throw new ResourceRegistryException(error);
 		}