diff --git a/htdocs/emailcollector/class/emailcollector.class.php b/htdocs/emailcollector/class/emailcollector.class.php
index fa5b500b40b..f9dfc34ba70 100644
--- a/htdocs/emailcollector/class/emailcollector.class.php
+++ b/htdocs/emailcollector/class/emailcollector.class.php
@@ -702,6 +702,16 @@ class EmailCollector extends CommonObject
 	 *
 	 * @return	int		0=OK, Nb of error if error
 	 */
+
+	/**
+	 * overwitePropertiesOfObject
+	 *
+	 * @param	object	$object			Current object
+	 * @param	string	$actionparam	Action parameters
+	 * @param	string	$messagetext	Body
+	 * @param	string	$subject		Subject
+	 * @return	int						0=OK, Nb of error if error
+	 */
 	private function overwritePropertiesOfObject(&$object, $actionparam, $messagetext, $subject)
 	{
 		$errorforthisaction = 0;
diff --git a/htdocs/langs/en_US/companies.lang b/htdocs/langs/en_US/companies.lang
index e026ac5673d..e5de5614886 100644
--- a/htdocs/langs/en_US/companies.lang
+++ b/htdocs/langs/en_US/companies.lang
@@ -431,4 +431,4 @@ SaleRepresentativeLogin=Login of sales representative
 SaleRepresentativeFirstname=First name of sales representative
 SaleRepresentativeLastname=Last name of sales representative
 ErrorThirdpartiesMerge=There was an error when deleting the third parties. Please check the log. Changes have been reverted.
-NewCustomerSupplierCodeProposed=New customer or vendor code suggested on duplicate code
+NewCustomerSupplierCodeProposed=Customer or vendor code already used, a new code is suggested
diff --git a/htdocs/langs/en_US/projects.lang b/htdocs/langs/en_US/projects.lang
index c83bccd19ad..2655ebbdc05 100644
--- a/htdocs/langs/en_US/projects.lang
+++ b/htdocs/langs/en_US/projects.lang
@@ -184,6 +184,7 @@ ProjectsWithThisUserAsContact=Projects with this user as contact
 TasksWithThisUserAsContact=Tasks assigned to this user
 ResourceNotAssignedToProject=Not assigned to project
 ResourceNotAssignedToTheTask=Not assigned to the task
+NoUserAssignedToTheProject=No users assigned to this project
 TimeSpentBy=Time spent by
 TasksAssignedTo=Tasks assigned to
 AssignTaskToMe=Assign task to me
@@ -232,3 +233,4 @@ DontHaveTheValidateStatus=The project %s must be open to be closed
 RecordsClosed=%s project(s) closed
 SendProjectRef=Information project %s
 ModuleSalaryToDefineHourlyRateMustBeEnabled=Module 'Payment of employee wages' must be enabled to define employee hourly rate to have time spent valorized
+NewTaskRefSuggested=Task ref already used, a new task ref is suggested
\ No newline at end of file
diff --git a/htdocs/projet/tasks.php b/htdocs/projet/tasks.php
index 093d66dd629..2f06f698b14 100644
--- a/htdocs/projet/tasks.php
+++ b/htdocs/projet/tasks.php
@@ -246,7 +246,18 @@ if ($action == 'createtask' && $user->rights->projet->creer)
 			}
 			else
 			{
-			    setEventMessages($task->error,$task->errors,'errors');
+				if ($db->lasterrno() == 'DB_ERROR_RECORD_ALREADY_EXISTS')
+				{
+					$langs->load("projects");
+					setEventMessages($langs->trans('NewTaskRefSuggested'),'', 'warnings');
+					$duplicate_code_error = true;
+				}
+				else
+				{
+					setEventMessages($task->error,$task->errors,'errors');
+				}
+				$action = 'create';
+				$error++;
 			}
 		}
 
@@ -462,7 +473,14 @@ if ($action == 'create' && $user->rights->projet->creer && (empty($object->third
 
 	// Ref
 	print '<tr><td class="titlefieldcreate"><span class="fieldrequired">'.$langs->trans("Ref").'</span></td><td>';
-	print ($_POST["ref"]?$_POST["ref"]:$defaultref);
+	if (empty($duplicate_code_error))
+	{
+		print (GETPOSTISSET("ref")?GETPOST("ref",'alpha'):$defaultref);
+	}
+	else
+	{
+		print $defaultref;
+	}
 	print '<input type="hidden" name="taskref" value="'.($_POST["ref"]?$_POST["ref"]:$defaultref).'">';
 	print '</td></tr>';