diff --git a/src/main/java/org/gcube/resourcemanagement/model/impl/entities/facets/ProvenanceFacetImpl.java b/src/main/java/org/gcube/resourcemanagement/model/impl/entities/facets/ProvenanceFacetImpl.java
index 27c4c80..1fae72f 100644
--- a/src/main/java/org/gcube/resourcemanagement/model/impl/entities/facets/ProvenanceFacetImpl.java
+++ b/src/main/java/org/gcube/resourcemanagement/model/impl/entities/facets/ProvenanceFacetImpl.java
@@ -41,21 +41,6 @@ public class ProvenanceFacetImpl extends FacetImpl implements ProvenanceFacet {
 		this.relationship = relationship;
 	}
 	
-	/**
-	 * @return the reference
-	 */
-	@Override
-	public UUID getReference() {
-		return reference;
-	}
-	
-	/**
-	 * @param reference the reference to set
-	 */
-	@Override
-	public void setReference(UUID reference) {
-		this.reference = reference;
-	}
 	/**
 	 * @return the document
 	 */
diff --git a/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/ProvenanceFacet.java b/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/ProvenanceFacet.java
index c9c3d90..f930e7f 100644
--- a/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/ProvenanceFacet.java
+++ b/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/ProvenanceFacet.java
@@ -3,8 +3,6 @@
  */
 package org.gcube.resourcemanagement.model.reference.entities.facets;
 
-import java.util.UUID;
-
 import org.gcube.com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import org.gcube.informationsystem.model.reference.entities.Facet;
 import org.gcube.informationsystem.types.annotations.ISProperty;
@@ -38,16 +36,11 @@ public interface ProvenanceFacet extends Facet {
 		wasDerivedFrom, wasGeneratedBy /* .... */
 	}
 	
-	@ISProperty(description = "Relationship with the resource indicated by UUID.")
+	@ISProperty(description = "Relationship with the resource indicated by ID.")
 	public Relationship getRelationship();
 	
 	public void setRelationship(Relationship relationship);
 	
-	@ISProperty(description = "UUID of the referenced resource.")
-	public UUID getReference();
-	
-	public void setReference(UUID reference);
-	
 	@ISProperty(description = "Provenance Document, e.g., an XML according to the reference schema.")
 	public ValueSchema getDocument();