diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/er/ERManagement.java b/src/main/java/org/gcube/informationsystem/resourceregistry/er/ERManagement.java
index 975a131..b49a3b6 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/er/ERManagement.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/er/ERManagement.java
@@ -165,10 +165,17 @@ public abstract class ERManagement<ERType extends ER, El extends Element> {
 	}
 	
 	public void setElementType(String erType) throws ResourceRegistryException {
-		this.elementType = erType;
-		if(erType == null || erType.compareTo("") == 0) {
-			erType = accessType.getName();
+		if(this.elementType==null) {
+			if(erType == null || erType.compareTo("") == 0) {
+				erType = accessType.getName();
+			}
+			this.elementType = erType;
+		}else {
+			if(elementType.compareTo(erType)!=0) {
+				throw new ResourceRegistryException("Provided type " + erType + " does not match with the one already known " + this.accessType);
+			}
 		}
+		
 		if(jsonNode != null) {
 			checkERMatch();
 		}