diff --git a/htdocs/fourn/class/fournisseur.commande.class.php b/htdocs/fourn/class/fournisseur.commande.class.php
index 112708a92b7..49948ebba06 100644
--- a/htdocs/fourn/class/fournisseur.commande.class.php
+++ b/htdocs/fourn/class/fournisseur.commande.class.php
@@ -3892,10 +3892,17 @@ class CommandeFournisseurLigne extends CommonOrderLine
 			return -1;
 		}
 
-		$sql = 'DELETE FROM '.MAIN_DB_PREFIX."commande_fournisseurdet WHERE rowid=".((int) $this->id);
+		$sql1 = 'UPDATE '.MAIN_DB_PREFIX."commandedet SET fk_commandefourndet = NULL WHERE rowid=".((int) $this->id);
+		$resql = $this->db->query($sql1);
+		if (!$resql) {
+			$this->db->rollback();
+			return -1;
+		}
+
+		$sql2 = 'DELETE FROM '.MAIN_DB_PREFIX."commande_fournisseurdet WHERE rowid=".((int) $this->id);
 
 		dol_syslog(__METHOD__, LOG_DEBUG);
-		$resql = $this->db->query($sql);
+		$resql = $this->db->query($sql2);
 		if ($resql) {
 			if (!$notrigger) {
 				// Call trigger