diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index 12dadebdd27..7f604659625 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -125,6 +125,7 @@ class Categorie
 	 * 	@return	int 				-1 : erreur SQL
 	 *          					-2 : nouvel ID inconnu
 	 *          					-3 : categorie invalide
+	 * 								-4 : category already exists
 	 */
 	function create($user='')
 	{
@@ -141,7 +142,7 @@ class Categorie
 		{
 			$this->error=$langs->trans("ImpossibleAddCat");
 			$this->error.=" : ".$langs->trans("CategoryExistsAtSameLevel");
-			return -1;
+			return -4;
 		}
 
 		$sql = "INSERT INTO ".MAIN_DB_PREFIX."categorie (label, description,";
@@ -176,7 +177,7 @@ class Categorie
 					if($this->add_fille() < 0)
 					{
 						$this->error=$langs->trans("ImpossibleAssociateCategory");
-						return -1;
+						return -3;
 					}
 				}
 
diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 0f80894cb2b..8c4a8b6f06e 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -2111,7 +2111,7 @@ class Commande extends CommonObject
      *  @param    	double			$pu               	Prix unitaire
      *  @param    	double			$qty              	Quantity
      *  @param    	double			$remise_percent   	Pourcentage de remise de la ligne
-     *  @param    	double			$tva_tx           	Taux TVA
+     *  @param    	double			$txtva           	Taux TVA
      * 	@param		double			$txlocaltax1		Local tax 1 rate
      *  @param		double			$txlocaltax2		Local tax 2 rate
      *  @param    	string			$price_base_type	HT or TTC
diff --git a/htdocs/core/class/ldap.class.php b/htdocs/core/class/ldap.class.php
index 3598497a3a9..8ed2d0cbbb6 100644
--- a/htdocs/core/class/ldap.class.php
+++ b/htdocs/core/class/ldap.class.php
@@ -1011,8 +1011,8 @@ class Ldap
 	 *  Converts a little-endian hex-number to one, that 'hexdec' can convert
 	 *	Required by Active Directory
 	 *
-	 *	@param	string		$hex
-	 *	@return	string		little endian
+	 *	@param	string		$hex			Hex value
+	 *	@return	string						Little endian		
 	 */
 	function littleEndian($hex)
 	{
diff --git a/test/phpunit/CategorieTest.php b/test/phpunit/CategorieTest.php
index 24693fdac20..f87a2c29d44 100755
--- a/test/phpunit/CategorieTest.php
+++ b/test/phpunit/CategorieTest.php
@@ -129,12 +129,16 @@ class CategorieTest extends PHPUnit_Framework_TestCase
 
 		$localobject=new Categorie($this->savdb);
     	$localobject->initAsSpecimen();
-    	$result=$localobject->create($user);
 
+		// We create category
+    	$result=$localobject->create($user);
     	$this->assertLessThan($result, 0);
     	print __METHOD__." result=".$result."\n";
 
-    	// TODO Add test on error when creating duplicate
+		// We try to create same category again
+    	$result=$localobject->create($user);
+    	$this->assertLessThan($result, -4);
+    	print __METHOD__." result=".$result."\n";
 
 
     	return $result;