diff --git a/scenario/HTML/to-string-acc_operation.php b/scenario/HTML/to-string-acc_operation.php
new file mode 100644
index 000000000..838f656f9
--- /dev/null
+++ b/scenario/HTML/to-string-acc_operation.php
@@ -0,0 +1,53 @@
+<?php
+//@description: Check that Acc_Operation and his children has implemented properly the _toString function
+/*
+ *   This file is part of NOALYSS.
+ *
+ *   NOALYSS is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   NOALYSS is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with NOALYSS; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+// Copyright Author Dany De Bontridder danydb@aevalys.eu 22/10/23
+
+
+/**
+ * @file
+ * @brief answer to an inplace object
+ */
+echo h1(_("Vente"));
+$obj=new Acc_Sold($cn,911);
+$obj->get();
+print '<pre>';
+print $obj;
+print '</pre>';
+
+echo h1(_("Opération diverse"));
+$obj=new Acc_Misc($cn,316);
+$obj->get();
+print '<pre>';
+print $obj;
+print '</pre>';
+
+echo h1(_("Financier"));
+$obj=new Acc_Fin($cn,142);
+$obj->get();
+print '<pre>';
+print $obj;
+print '</pre>';
+
+echo h1(_("Achat"));
+$obj=new Acc_Purchase($cn,141);
+$obj->get();
+print '<pre>';
+print $obj;
+print '</pre>';
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