diff --git a/www/pages/seriennummern.php b/www/pages/seriennummern.php
index 5d065933..88a3bfab 100644
--- a/www/pages/seriennummern.php
+++ b/www/pages/seriennummern.php
@@ -1572,7 +1572,9 @@ class Seriennummern {
UCASE(LEFT(sbp.beleg_typ, 1)),
SUBSTRING(sbp.beleg_typ, 2)
) AS Belegtyp,
- COALESCE(l.belegnr,w.id) AS Beleg,
+ COALESCE(IF(w.id IS NOT NULL, CONCAT('', w.id, ''), NULL),
+ IF(l.id IS NOT NULL, CONCAT('', l.belegnr, ''), NULL),
+ '') AS Beleg,
".$this->app->erp->FormatDate('COALESCE(l.datum,w.datum)')." AS Datum,
COALESCE(al.name,aw.name) AS Adresse
FROM seriennummern_beleg_position sbp