diff --git a/htdocs/fourn/class/fournisseur.commande.class.php b/htdocs/fourn/class/fournisseur.commande.class.php
index f656e7a41e7..053e5b314d6 100644
--- a/htdocs/fourn/class/fournisseur.commande.class.php
+++ b/htdocs/fourn/class/fournisseur.commande.class.php
@@ -2346,8 +2346,11 @@ class CommandeFournisseur extends CommonOrder
 
             $subprice = price2num($pu_ht,'MU');
 
+            //Fetch current line from the database and then clone the object and set it in $oldline property
             $this->line=new CommandeFournisseurLigne($this->db);
             $this->line->fetch($rowid);
+            $oldline = clone $this->line;
+            $this->line->oldline = $oldline;
 
             $this->line->context = $this->context;