diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 9854f2c8093..169c24cb171 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -2320,38 +2320,26 @@ class Commande extends CommonObject
         dol_syslog("Commande::delete sql=".$sql);
         if (! $this->db->query($sql) )
         {
-            dol_syslog("CustomerOrder::delete error", LOG_ERR);
+            dol_syslog(get_class($this)."::delete error", LOG_ERR);
             $error++;
         }
 
         // Delete order
         $sql = 'DELETE FROM '.MAIN_DB_PREFIX."commande WHERE rowid = ".$this->id;
-        dol_syslog("Commande::delete sql=".$sql);
+        dol_syslog(get_class($this)."::delete sql=".$sql, LOG_DEBUG);
         if (! $this->db->query($sql) )
         {
-            dol_syslog("CustomerOrder::delete error", LOG_ERR);
+            dol_syslog(get_class($this)."::delete error", LOG_ERR);
             $error++;
         }
 
         // Delete linked object
-        // TODO deplacer dans le common
-        $sql = "DELETE FROM ".MAIN_DB_PREFIX."element_element";
-        $sql.= " WHERE fk_target = ".$this->id;
-        $sql.= " AND targettype = '".$this->element."'";
-        dol_syslog("Commande::delete sql=".$sql);
-        if (! $this->db->query($sql) )
-        {
-            dol_syslog("CustomerOrder::delete error", LOG_ERR);
-            $error++;
-        }
+        $res = $this->deleteObjectLinked();
+        if ($res < 0) $error++;
 
         // Delete linked contacts
         $res = $this->delete_linked_contact();
-        if ($res < 0)
-        {
-            dol_syslog("CustomerOrder::delete error", LOG_ERR);
-            $error++;
-        }
+        if ($res < 0) $error++;
 
         // On efface le repertoire de pdf provisoire
         $comref = dol_sanitizeFileName($this->ref);
@@ -2381,7 +2369,7 @@ class Commande extends CommonObject
             }
         }
 
-        if ($error == 0)
+        if (! $error)
         {
             // Appel des triggers
             include_once(DOL_DOCUMENT_ROOT . "/core/class/interfaces.class.php");
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index ad5624f8a3f..7fcaaced30c 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -1130,12 +1130,12 @@ class Facture extends CommonObject
 
         $error=0;
         $this->db->begin();
+        
+        // Delete linked object
+        $res = $this->deleteObjectLinked();
+        if ($res < 0) $error++;
 
-        $sql = "DELETE FROM ".MAIN_DB_PREFIX."element_element";
-        $sql.= " WHERE fk_target = ".$rowid;
-        $sql.= " AND targettype = '".$this->element."'";
-
-        if ($this->db->query($sql))
+        if (! $error)
         {
         	// If invoice was converted into a discount not yet consumed, we remove discount
             $sql = 'DELETE FROM '.MAIN_DB_PREFIX.'societe_remise_except';
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 4465d79aa06..99c19c3af7c 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -294,7 +294,7 @@ abstract class CommonObject
         $sql.= " WHERE element_id =".$this->id;
         $sql.= " AND fk_c_type_contact IN (".$listId.")";
 
-        dol_syslog(get_class($this)."::delete_linked_contact sql=".$sql);
+        dol_syslog(get_class($this)."::delete_linked_contact sql=".$sql, LOG_DEBUG);
         if ($this->db->query($sql))
         {
             return 1;
diff --git a/htdocs/expedition/class/expedition.class.php b/htdocs/expedition/class/expedition.class.php
index e9fd3cfbd76..73295740d16 100644
--- a/htdocs/expedition/class/expedition.class.php
+++ b/htdocs/expedition/class/expedition.class.php
@@ -761,16 +761,16 @@ class Expedition extends CommonObject
 
 		if ( $this->db->query($sql) )
 		{
-			$sql = "DELETE FROM ".MAIN_DB_PREFIX."element_element";
-			$sql.= " WHERE fk_target = ".$this->id;
-			$sql.= " AND targettype = '".$this->element."'";
+			// Delete linked object
+			$res = $this->deleteObjectLinked();
+			if ($res < 0) $error++;
 
-			if ( $this->db->query($sql) )
+			if (! $error)
 			{
 				$sql = "DELETE FROM ".MAIN_DB_PREFIX."expedition";
 				$sql.= " WHERE rowid = ".$this->id;
 
-				if ( $this->db->query($sql) )
+				if ($this->db->query($sql))
 				{
 					$this->db->commit();
 
diff --git a/htdocs/fichinter/class/fichinter.class.php b/htdocs/fichinter/class/fichinter.class.php
index ca3eb2cbbb1..b72df22e2de 100644
--- a/htdocs/fichinter/class/fichinter.class.php
+++ b/htdocs/fichinter/class/fichinter.class.php
@@ -585,16 +585,8 @@ class Fichinter extends CommonObject
 		$this->db->begin();
 
 		// Delete linked object
-		$sql = "DELETE FROM ".MAIN_DB_PREFIX."element_element";
-		$sql.= " WHERE fk_target = ".$this->id;
-		$sql.= " AND targettype = '".$this->element."'";
-		dol_syslog("Fichinter::delete sql=".$sql);
-		if (! $this->db->query($sql) )
-		{
-			dol_syslog("Fichinter::delete error", LOG_ERR);
-			$this->error=$this->db->lasterror();
-			$error++;
-		}
+        $res = $this->deleteObjectLinked();
+        if ($res < 0) $error++;
 
 		// Delete linked contacts
 		$res = $this->delete_linked_contact();
diff --git a/htdocs/livraison/class/livraison.class.php b/htdocs/livraison/class/livraison.class.php
index 72d1822e746..5d41bca48f4 100644
--- a/htdocs/livraison/class/livraison.class.php
+++ b/htdocs/livraison/class/livraison.class.php
@@ -549,15 +549,18 @@ class Livraison extends CommonObject
 	{
         require_once(DOL_DOCUMENT_ROOT."/core/lib/files.lib.php");
 		$this->db->begin();
+		
+		$error=0;
 
 		$sql = "DELETE FROM ".MAIN_DB_PREFIX."livraisondet";
 		$sql.= " WHERE fk_livraison = ".$this->id;
-		if ( $this->db->query($sql) )
+		if ($this->db->query($sql))
 		{
-			$sql = "DELETE FROM ".MAIN_DB_PREFIX."element_element";
-			$sql.= " WHERE fk_target = ".$this->id;
-			$sql.= " AND targettype = '".$this->element."'";
-			if ( $this->db->query($sql) )
+			// Delete linked object
+			$res = $this->deleteObjectLinked();
+			if ($res < 0) $error++;
+			
+			if (! $error)
 			{
 				$sql = "DELETE FROM ".MAIN_DB_PREFIX."livraison";
 				$sql.= " WHERE rowid = ".$this->id;