diff --git a/src/main/java/org/gcube/gcat/persistence/ckan/CKANPackage.java b/src/main/java/org/gcube/gcat/persistence/ckan/CKANPackage.java
index 97c8c7e..7cec842 100644
--- a/src/main/java/org/gcube/gcat/persistence/ckan/CKANPackage.java
+++ b/src/main/java/org/gcube/gcat/persistence/ckan/CKANPackage.java
@@ -230,14 +230,20 @@ public class CKANPackage extends CKAN implements Moderated {
 	 * 
 	 */
 	public ObjectNode checkAuthor(ObjectNode objectNode, String authorName, String authorEmail) {
-		if(!updateOperation) { // this prevent to change the original author in case of update
+		if(!updateOperation) {
 			objectNode.put(AUTHOR_KEY, authorName);
 			objectNode.put(AUTHOR_EMAIL_KEY, authorEmail);
-		}else {
+		}else { // this prevent to change the original author in case of update
 			Role role = ckanUser.getRole();
 			if(role.ordinal() <  Role.ADMIN.ordinal()) {
-				objectNode.remove(AUTHOR_KEY);
-				objectNode.remove(AUTHOR_EMAIL_KEY);
+				if(result.get(AUTHOR_KEY).asText().compareTo(authorName)!=0) {
+					throw new BadRequestException("Only Catalogue-Admins or above can change the authorship (i.e. " + AUTHOR_KEY + " field) of an item.");
+				}
+				
+				if(result.get(AUTHOR_EMAIL_KEY).asText().compareTo(authorEmail)!=0) {
+					throw new BadRequestException("Only Catalogue-Admins or above can change the authorship (i.e. " + AUTHOR_EMAIL_KEY + " field) of an item.");
+				}
+
 			}
 		}
 		return objectNode;
@@ -263,7 +269,14 @@ public class CKANPackage extends CKAN implements Moderated {
 		
 		// We need to enforce the itemID to properly manage resource persistence
 		if(objectNode.has(ID_KEY)) {
-			itemID = objectNode.get(ID_KEY).asText();
+			String id = objectNode.get(ID_KEY).asText();
+			if(itemID==null) {
+				itemID = id; 
+			}else {
+				if(id.compareTo(itemID)!=0) {
+					throw new BadRequestException("Item ID comntained in the request body does not match with the id of the item in Ckan.");
+				}
+			}
 		}
 		
 		// To include private item in search result (e.g. listing) a private package must be searchable
@@ -335,7 +348,7 @@ public class CKANPackage extends CKAN implements Moderated {
 		return objectNode;
 	}
 	
-	protected JsonNode validateJson(String json) {
+	protected JsonNode validateJso(String json) {
 		try {
 			// check base information (and set them if needed)
 			ObjectNode objectNode = checkBaseInformation(json);
@@ -859,8 +872,6 @@ public class CKANPackage extends CKAN implements Moderated {
 		try {
 			this.updateOperation = true;
 			
-			JsonNode jsonNode = validateJson(json);
-			
 			/*
 			 * Going to read the item from CKAN just to check the item status.
 			 * I need to reset the result first because the current contains 
@@ -869,6 +880,8 @@ public class CKANPackage extends CKAN implements Moderated {
 			this.result = null;
 			readItem();
 			
+			JsonNode jsonNode = validateJson(json);
+			
 			jsonNode = checkModerationUpdate(jsonNode);
 			
 			Map<String,CKANResource> originalResources = new HashMap<>();