fix undefined property in expensereportline class (#31854)

Co-authored-by: Hystepik <lmarcouiller@nltechno.com>
Co-authored-by: Laurent Destailleur <eldy@destailleur.fr>

htdocs/expensereport/class/expensereportline.class.php

@@ -268,7 +268,7 @@ public function fetch($rowid)
 
 			$this->rowid = $objp->rowid;
 			$this->id = $objp->rowid;
-			$this->ref = $objp->ref;
+			//$this->ref = $objp->ref; Undefined property
 			$this->fk_expensereport = $objp->fk_expensereport;
 			$this->comments = $objp->comments;
 			$this->qty = $objp->qty;