diff --git a/htdocs/variants/class/ProductAttributeValue.class.php b/htdocs/variants/class/ProductAttributeValue.class.php
index 0a26b3eace2..2c48a6ce7ce 100644
--- a/htdocs/variants/class/ProductAttributeValue.class.php
+++ b/htdocs/variants/class/ProductAttributeValue.class.php
@@ -16,17 +16,18 @@
  * along with this program. If not, see <https://www.gnu.org/licenses/>.
  */
 
+require_once DOL_DOCUMENT_ROOT.'/core/class/commonobject.class.php';
 /**
  * Class ProductAttributeValue
  * Used to represent a product attribute value
  */
-class ProductAttributeValue
+class ProductAttributeValue extends CommonObject
 {
 	/**
 	 * Database handler
 	 * @var DoliDB
 	 */
-	private $db;
+	public $db;
 
 	/**
 	 * Attribute value id
@@ -144,14 +145,24 @@ class ProductAttributeValue
 	/**
 	 * Creates a value for a product attribute
 	 *
-	 * @param	User	$user		Object user
-	 * @return 	int 				<0 KO >0 OK
+	 * @param  User $user      Object user
+     * @param  int  $notrigger Do not execute trigger
+	 * @return int <0 KO >0 OK
 	 */
-	public function create(User $user)
+	public function create(User $user, $notrigger = 0)
 	{
 		if (!$this->fk_product_attribute) {
 			return -1;
 		}
+		
+		if (empty($notrigger)) {
+		    // Call trigger
+		    $result = $this->call_trigger('PRODUCT_ATTRIBUTE_VALUE_CREATE', $user);
+		    if ($result < 0) {
+		        return -1;
+		    }
+		    // End call triggers
+		}
 
 		// Ref must be uppercase
 		$this->ref = strtoupper($this->ref);
@@ -173,11 +184,21 @@ class ProductAttributeValue
 	/**
 	 * Updates a product attribute value
 	 *
-	 * @param	User	$user	Object user
-	 * @return 	int				<0 if KO, >0 if OK
+	 * @param  User	$user	   Object user
+     * @param  int  $notrigger Do not execute trigger
+	 * @return int <0 if KO, >0 if OK
 	 */
-	public function update(User $user)
+	public function update(User $user, $notrigger = 0)
 	{
+	    if (empty($notrigger)) {
+	        // Call trigger
+	        $result = $this->call_trigger('PRODUCT_ATTRIBUTE_VALUE_MODIFY', $user);
+	        if ($result < 0) {
+	            return -1;
+	        }
+	        // End call triggers
+	    }
+	    
 		//Ref must be uppercase
 		$this->ref = trim(strtoupper($this->ref));
 		$this->value = trim($this->value);
@@ -196,33 +217,63 @@ class ProductAttributeValue
 	/**
 	 * Deletes a product attribute value
 	 *
+	 * @param  User $user      Object user
+     * @param  int  $notrigger Do not execute trigger
 	 * @return int <0 KO, >0 OK
 	 */
-	public function delete()
+	public function delete(User $user, $notrigger = 0)
 	{
-		$sql = "DELETE FROM ".MAIN_DB_PREFIX."product_attribute_value WHERE rowid = ".(int) $this->id;
-
-		if ($this->db->query($sql)) {
-			return 1;
-		}
-
-		return -1;
+	    if (empty($notrigger)) {
+	        // Call trigger
+	        $result = $this->call_trigger('PRODUCT_ATTRIBUTE_VALUE_DELETE', $user);
+	        if ($result < 0) {
+	            return -1;
+	        }
+	        // End call triggers
+	    }
+	    
+	    $sql = "DELETE FROM ".MAIN_DB_PREFIX."product_attribute_value WHERE rowid = ".(int) $this->id;
+	    
+	    if ($this->db->query($sql)) {
+	        return 1;
+	    }
+	    
+	    return -1;
 	}
 
 	/**
 	 * Deletes all product attribute values by a product attribute id
 	 *
 	 * @param int $fk_attribute Product attribute id
+     * @param  int  $notrigger Do not execute trigger
 	 * @return int <0 KO, >0 OK
 	 */
-	public function deleteByFkAttribute($fk_attribute)
+	public function deleteByFkAttribute($fk_attribute, User $user)
 	{
-		$sql = "DELETE FROM ".MAIN_DB_PREFIX."product_attribute_value WHERE fk_product_attribute = ".(int) $fk_attribute;
-
-		if ($this->db->query($sql)) {
-			return 1;
-		}
-
-		return -1;
+	    $sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."product_attribute_value WHERE fk_product_attribute = ".(int) $fk_attribute;
+	    
+	    $query = $this->db->query($sql);
+	    
+	    if (!$query) {
+	        return -1;
+	    }
+	    
+	    if (!$this->db->num_rows($query)) {
+	        return 1;
+	    }
+	    
+	    while ($obj = $this->db->fetch_object($query)) {
+	        $tmp = new ProductAttributeValue($this->db);
+	        if ($tmp->fetch($obj->rowid) > 0) {
+    	        $result = $tmp->delete($user);
+    	        if ($result < 0) {
+    	            return -1;
+    	        }
+	        } else {
+	            return -1;
+	        }
+	    }
+	    
+	    return 1;
 	}
 }