diff --git a/src/main/java/org/gcube/informationsystem/exporter/mapper/GCoreResourceMapper.java b/src/main/java/org/gcube/informationsystem/exporter/mapper/GCoreResourceMapper.java
index a4432f1..4227876 100644
--- a/src/main/java/org/gcube/informationsystem/exporter/mapper/GCoreResourceMapper.java
+++ b/src/main/java/org/gcube/informationsystem/exporter/mapper/GCoreResourceMapper.java
@@ -154,7 +154,7 @@ public abstract class GCoreResourceMapper<GR extends org.gcube.common.resources.
 		boolean update = false;
 
 		try {
-			update = resourceRegistryClient.exists(rClass, uuid);
+			update = resourceRegistryClient.existInstance(rClass, uuid);
 		} catch (NotFoundException e) {
 			update = false;
 		} catch (AvailableInAnotherContextException e) {
diff --git a/src/main/java/org/gcube/informationsystem/exporter/mapper/GenericResourceExporter.java b/src/main/java/org/gcube/informationsystem/exporter/mapper/GenericResourceExporter.java
index 96c08c8..3ef43de 100644
--- a/src/main/java/org/gcube/informationsystem/exporter/mapper/GenericResourceExporter.java
+++ b/src/main/java/org/gcube/informationsystem/exporter/mapper/GenericResourceExporter.java
@@ -47,7 +47,7 @@ public class GenericResourceExporter extends GCoreResourceMapper<GenericResource
 		SimpleFacet simpleFacet = null;
 		
 		try {
-			readFromIS = resourceRegistryClient.exists(rClass, uuid);
+			readFromIS = resourceRegistryClient.existInstance(rClass, uuid);
 		} catch(NotFoundException e) {
 			readFromIS = false;
 		} catch(AvailableInAnotherContextException e) {
diff --git a/src/main/java/org/gcube/informationsystem/exporter/mapper/ServiceEndpointExporter.java b/src/main/java/org/gcube/informationsystem/exporter/mapper/ServiceEndpointExporter.java
index 541d135..bfdcc74 100644
--- a/src/main/java/org/gcube/informationsystem/exporter/mapper/ServiceEndpointExporter.java
+++ b/src/main/java/org/gcube/informationsystem/exporter/mapper/ServiceEndpointExporter.java
@@ -79,7 +79,7 @@ public class ServiceEndpointExporter extends GCoreResourceMapper<ServiceEndpoint
 		NetworkingFacet networkingFacet = null;
 		
 		try {
-			readFromIS = resourceRegistryClient.exists(rClass, uuid);
+			readFromIS = resourceRegistryClient.existInstance(rClass, uuid);
 		} catch(NotFoundException e) {
 			readFromIS = false;
 		} catch(AvailableInAnotherContextException e) {