diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java
index 78d03d4..9e65058 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java
@@ -70,6 +70,9 @@ public abstract class HelperMethods {
 	public static final String PREVALIDATE_CONTEX_KEY = "PreValidateVRE";
 	public static final String PUBLIC_CONTEX_KEY = "PublicVRE";
 	private static final String PATH_SEPARATOR = "/";
+	
+	// This key is used in replaceFieldsKey() function to indicate to remove the metadata field
+	private static final String NONE_KEY = "none";
 
 	// caches
 	private static CacheInterface<String, String> userEmailCache = new CacheImpl<String, String>(1000 * 60 * 60 * 24);
@@ -571,16 +574,18 @@ public abstract class HelperMethods {
 
 			if(namespaces.containsKey(entry.getKey())){
 				usedKey = namespaces.get(entry.getKey());
-			}
-			else{
+			} else{
 				usedKey = entry.getKey();
 			}
 
-			if(isSourceRecord)
+			if(isSourceRecord) {
 				usedKey = usedKey.replace("GRSF", "").trim();
+			}
 
-			toReturn.put(usedKey, entry.getValue());
-
+			// When the replaced key is none the metadata field must be removed
+			if(usedKey.compareTo(NONE_KEY)!=0) {
+				toReturn.put(usedKey, entry.getValue());
+			}
 		}
 
 		return toReturn;