diff --git a/htdocs/fourn/class/fournisseur.facture.class.php b/htdocs/fourn/class/fournisseur.facture.class.php
index ab69fbeceb97a..d6044ee2c7166 100644
--- a/htdocs/fourn/class/fournisseur.facture.class.php
+++ b/htdocs/fourn/class/fournisseur.facture.class.php
@@ -474,11 +474,6 @@ public function create($user)
 			if (! $this->type) {
 				$this->type = self::TYPE_STANDARD;
 			}
-			if (!empty(GETPOST('ref_supplier'))) {
-				$this->ref_supplier = trim($this->ref_supplier);
-			} else {
-				$this->ref_supplier = trim($this->ref_supplier . '_' . ($_facrec->nb_gen_done + 1));
-			}
 			$this->note_public = trim($this->note_public);
 			$this->note_private = trim($this->note_private);
 			$this->note_private = dol_concatdesc($this->note_private, $langs->trans("GeneratedFromRecurringInvoice", $_facrec->title));
@@ -499,6 +494,7 @@ public function create($user)
 
 			// For recurring invoices, update date and number of last generation of recurring template invoice, before inserting new invoice
 			if ($_facrec->frequency > 0) {
+				$this->ref_supplier = trim($this->ref_supplier . '_' . ($_facrec->nb_gen_done + 1));
 				dol_syslog("This is a recurring invoice so we set date_last_gen and next date_when");
 				if (empty($_facrec->date_when)) {
 					$_facrec->date_when = $now;