diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/proxy/ResourceRegistryPublisherImpl.java b/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/proxy/ResourceRegistryPublisherImpl.java
index e55aab5..ec88120 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/proxy/ResourceRegistryPublisherImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/publisher/proxy/ResourceRegistryPublisherImpl.java
@@ -279,7 +279,13 @@ public class ResourceRegistryPublisherImpl implements ResourceRegistryPublisher
 			String res = result.toString();
 			logger.trace("Server returned content : {}", res);
 
-			return (C) ISMapper.unmarshal((Class<ISManageable>) clazz, res);
+			if(Boolean.class.isAssignableFrom(clazz)){
+				return (C) ((Boolean) Boolean.getBoolean(res)) ;
+			}else if(ISManageable.class.isAssignableFrom(clazz)){
+				return (C) ISMapper.unmarshal((Class<ISManageable>) clazz, res);
+			}
+			
+			return (C) res;
 		}
 
 	}