diff --git a/htdocs/fourn/class/fournisseur.facture.class.php b/htdocs/fourn/class/fournisseur.facture.class.php
index 292466ea0d8..8580bec8cd9 100644
--- a/htdocs/fourn/class/fournisseur.facture.class.php
+++ b/htdocs/fourn/class/fournisseur.facture.class.php
@@ -1436,6 +1436,12 @@ class FactureFournisseur extends CommonInvoice
         // Check parameters
         if ($type < 0) return -1;
 
+        if ($rang < 0)
+        {
+        	$rangmax = $this->line_max();
+        	$rang = $rangmax + 1;
+        }
+
         // Insert line
         $this->line=new SupplierInvoiceLine($this->db);
 
diff --git a/htdocs/fourn/facture/card.php b/htdocs/fourn/facture/card.php
index 0fc05bd7627..cc9164b753f 100644
--- a/htdocs/fourn/facture/card.php
+++ b/htdocs/fourn/facture/card.php
@@ -265,7 +265,7 @@ if (empty($reshook))
 			$action='';
 		}
 	}
-	
+
 	elseif ($action == 'confirm_paid' && $confirm == 'yes' && $user->rights->fournisseur->facture->creer)
 	{
 		$object->fetch($id);
@@ -999,6 +999,8 @@ if (empty($reshook))
 				$type = $productsupplier->type;
 				$price_base_type = 'HT';
 
+				$rang = $object->line_max() +1;
+
 				$result=$object->addline(
 					$desc,
 					$productsupplier->fourn_pu,
@@ -1014,7 +1016,7 @@ if (empty($reshook))
 					$tva_npr,
 					$price_base_type,
 					$type,
-					-1,
+					$rang,
 					0,
 					$array_options,
 					$productsupplier->fk_unit,