[backend] Référence documents : correction bug génération référence

common/models/Document.php

                 }
 
                 $prefix = Producer::getConfig('document_' . $classLower . '_prefix');
-                $oneDocumentExist = $class::searchOne([], ['orderby' => 'reference DESC']);
+                $oneDocumentExist = $class::searchOne(['status' => Document::STATUS_VALID] , ['orderby' => 'reference DESC']);
 
                 if ($oneDocumentExist) {
                         $reference = $oneDocumentExist->reference;