diff --git a/html/js/acc_ledger.js b/html/js/acc_ledger.js
index 6663c8405..e8b1371e2 100644
--- a/html/js/acc_ledger.js
+++ b/html/js/acc_ledger.js
@@ -1210,13 +1210,13 @@ function success_dsp_letter(req) {
     try {
         code_html.evalScripts();
     } catch (e) {
-        alert_box("DSPLETTER:" + content[48] + e.message);
+        alert_box("DSPLETTER1:" + content[48] + e.message);
     }
 
 }
 
 function error_dsp_letter(req) {
-    alert_box("DSPLETTER:" + content[48]);
+    alert_box("DSPLETTER2:" + content[48]);
 }
 
 function search_letter(obj) {
diff --git a/html/js/noalyss_script.js b/html/js/noalyss_script.js
index d4ebda780..8270a4a10 100644
--- a/html/js/noalyss_script.js
+++ b/html/js/noalyss_script.js
@@ -3571,7 +3571,7 @@ var Periode = function (p_ledger) {
             }
         }
         if (count == 0) {
-            smoke.signal("Sélectionner au moins une période", function () {
+             smoke.signal("Sélectionner au moins une période", function () {
             }, {duration: 1500});
             return;
         }
diff --git a/html/test.php b/html/test.php
index 89d3fc4d7..3025d438e 100644
--- a/html/test.php
+++ b/html/test.php
@@ -65,17 +65,6 @@ if (!file_exists('authorized_debug'))
 define('ALLOWED', 1);
 load_all_script();
 // To enable assert , set "zend.assertions" in the php.ini file
-ini_set("assert.active",1);
-// assert_options(ASSERT_ACTIVE, 1);
-// assert_options(ASSERT_WARNING, 1);
-//removed in PHP8 assert_options(ASSERT_QUIET_EVAL, 1);
-function my_assert_handler($file, $line, $code)
-{
-    echo "<hr>Assert Failed :
-        File '$file'<br />
-        Line '$line'<br />
-        Code '$code'<br /><hr />";
-}
 /******************************************************************************************************************/
 /*  Utilities 
 /******************************************************************************************************************/
@@ -279,4 +268,4 @@ else
     echo "<p>Diff = ".(round(($end_mem-$start_mem)/1024/1024, 2))." Mbytes ";
     echo '</p>';
     echo "<p>Execution script ".$script." time = ".(round(($end_time-$start_time), 4))." secondes</p>";
-}    
\ No newline at end of file
+}    
diff --git a/include/ajax/ajax_display_letter.php b/include/ajax/ajax_display_letter.php
index bfd8d391a..d52330045 100644
--- a/include/ajax/ajax_display_letter.php
+++ b/include/ajax/ajax_display_letter.php
@@ -231,7 +231,8 @@ $html.=$date_error;
 //       echo $html;exit;
 $html=escape_xml($html);
 
-header('Content-type: text/xml; charset=UTF-8');
+if (! defined('TEST_UNIT'))
+    header('Content-type: text/xml; charset=UTF-8');
 echo <<<EOF
 <?xml version="1.0" encoding="UTF-8"?>
 <data>
diff --git a/include/class/lettering.class.php b/include/class/lettering.class.php
index 33b1fc1c1..ef970cad1 100644
--- a/include/class/lettering.class.php
+++ b/include/class/lettering.class.php
@@ -20,11 +20,13 @@
 
 // Copyright Author Dany De Bontridder danydb@aevalys.eu
 
-/* !\file
+/*!
+ *\file
  * \brief letter the accounting entry (row level)
  */
 
 /**
+ * @class
  * @brief mother class for the lettering by account and by card
  * use the tables jnt_letter, letter_deb and letter_cred
  * - "account"=>"account",       => the accounting of the j_id (use by Lettering_Account)
@@ -32,7 +34,14 @@
  * - "start"=>"start",	   => date of the first day
  * - "end"=>"end",		   => date of the last day
  * - "sql_ledger"=>"sql_ledger"  => the sql clause to filter on the available ledgers
+ *
+ * @see unit-test/include/class/acc_letterTest.php
+ * @see test scenario scenario/XML/ajax_display_letter.php
  */
+
+
+
+#[\AllowDynamicProperties]
 class Lettering
 {
 
@@ -50,6 +59,7 @@ class Lettering
     var $sql_ledger;
     var $object_type;
     var $content;
+
     /**
      * constructor
      * @param $p_init resource to database
@@ -351,7 +361,7 @@ class Lettering
     }
 
     /**
-     * show only the lettered records from jrnx
+     * @brief show only the lettered records from jrnx
      * it fills the array $this->content
      */
     protected function show_lettered()
@@ -366,7 +376,7 @@ class Lettering
     }
 
     /**
-     * show only the lettered records from jrnx
+     * @brief show only the lettered records from jrnx
      * it fills the array $this->content
      */
     protected function show_lettered_diff()
@@ -381,7 +391,7 @@ class Lettering
     }
 
     /**
-     * show only the not lettered records from jrnx
+     * @brief show only the not lettered records from jrnx
      * it fills the array $this->content
      */
     protected function show_not_lettered()
@@ -479,8 +489,12 @@ class Lettering
 }
 
 /**
- * only for operation retrieved thanks a account (jrnx.j_poste)
+ *@class
+ * @brief only for operation retrieved thanks a account (jrnx.j_poste)
  * manage the accounting entries for a given account
+ *
+ * @see unit-test/include/class/acc_letterTest.php
+ *
  */
 class Lettering_Account extends Lettering
 {
@@ -493,7 +507,7 @@ class Lettering_Account extends Lettering
     }
 
     /**
-     * fills the this->content, datas are filtered thanks
+     * @brief fills the this->content, datas are filtered thanks
      * - fil_deb poss values t (debit), f(credit), ' ' (everything)
      * - fil_amount_max max amount
      * - fil_amount_min min amount
@@ -548,7 +562,7 @@ class Lettering_Account extends Lettering
     }
 
     /**
-     * fills this->content with all the operation for the this->account(jrnx.j_poste)
+     * @brief fills this->content with all the operation for the this->account(jrnx.j_poste)
      */
     public function get_all()
     {
@@ -577,7 +591,7 @@ class Lettering_Account extends Lettering
     }
 
     /**
-     * same as get_all but only for lettered operation
+     * @brief same as get_all but only for lettered operation
      */
     public function get_letter()
     {
@@ -606,7 +620,7 @@ class Lettering_Account extends Lettering
     }
 
     /**
-     * same as get_all but only for lettered operation
+     *@brief same as get_all but only for lettered operation
      */
     public function get_letter_diff()
     {
@@ -637,7 +651,7 @@ class Lettering_Account extends Lettering
     }
 
     /**
-     * same as get_all but only for unlettered operation
+     *@brief  same as get_all but only for unlettered operation
      */
     public function get_unletter()
     {
@@ -663,7 +677,8 @@ class Lettering_Account extends Lettering
 }
 
 /**
- * only for operation retrieved thanks a quick_code
+ * @class
+ * @brief only for operation retrieved thanks a quick_code
  * manage the accounting entries for a given card
  */
 class Lettering_Card extends Lettering
@@ -683,7 +698,7 @@ class Lettering_Card extends Lettering
     }
 
     /**
-     * fills the this->content, datas are filtered thanks
+     *@brief  fills the this->content, datas are filtered thanks
      * - fil_deb poss values t (debit), f(credit), ' ' (everything)
      * - fil_amount_max max amount
      * - fil_amount_min min amount
@@ -743,7 +758,7 @@ class Lettering_Card extends Lettering
     }
 
     /**
-     * fills this->content with all the operation for the this->quick_code(j_qcode)
+     * @brief fills this->content with all the operation for the this->quick_code(j_qcode)
      */
     public function get_all()
     {
@@ -773,7 +788,7 @@ class Lettering_Card extends Lettering
     }
 
     /**
-     * same as get_all but only for lettered operation
+     * @brief  same as get_all but only for lettered operation
      */
     public function get_letter()
     {
@@ -801,6 +816,10 @@ class Lettering_Card extends Lettering
         $this->content=$this->db->get_array($sql, array($this->quick_code, $this->start, $this->end));
     }
 
+    /**
+     * @brief  lettered operation with a different amount
+     * @return void
+     */
     public function get_letter_diff()
     {
         $sql="
@@ -829,7 +848,7 @@ class Lettering_Card extends Lettering
     }
 
     /**
-     * same as get_all but only for unlettered operation
+     * @brief  same as get_all but only for unlettered operation
      */
     public function get_unletter()
     {
@@ -852,7 +871,7 @@ class Lettering_Card extends Lettering
     }
 
     /**
-     * fill $this->content with the rows from this query
+     * @brief fill $this->content with the rows from this query
      * Columns are 
      *  - j_id, id of jrnx
      *  - j_date, date opeation (yyyy.mm.dd)
diff --git a/include/lettering.gestion.inc.php b/include/lettering.gestion.inc.php
index 1749d2577..ac201118d 100644
--- a/include/lettering.gestion.inc.php
+++ b/include/lettering.gestion.inc.php
@@ -17,10 +17,13 @@
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 // Copyright(2004) Dany De Bontridder danydb@aevalys.eu
-/*! \file
- * \brief lettering
+/*!
+ * \file
+ * \brief lettering : included from include/category_card.inc.php, which is part of manager.inc.php, customer.inc.php,...
+ *
  * some variable are already defined ($cn, $g_user ...)
  */
+Noalyss\Dbg::echo_file(__FILE__);
 if ( ! defined ('ALLOWED') ) die('Appel direct ne sont pas permis');
 global $g_user;
 echo '<div class="content">';
@@ -41,13 +44,13 @@ $periode=new Periode($cn);
 list($first_per,$last_per)=$periode->get_limit($exercice);
 
 $start=new IDate('start');
-$start->value=(isset($_GET['start']))?$http->get('start'):$first_per->first_day();
+$start->value=(isset($_GET['start']))?$http->get('start','date'):$first_per->first_day();
 $r=td(_('Date début'));
 $r.=td($start->input());
 echo tr($r);
 
 $end=new IDate('end');
-$end->value=(isset($_GET['end']))?$_GET['end']:$last_per->last_day();
+$end->value=(isset($_GET['end']))?$http->get('end','date'):$last_per->last_day();
 $r=td(_('Date fin'));
 $r.=td($end->input());
 echo tr($r);
diff --git a/scenario/XML/ajax_display_letter.php b/scenario/XML/ajax_display_letter.php
new file mode 100644
index 000000000..4e81bab88
--- /dev/null
+++ b/scenario/XML/ajax_display_letter.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * @brief test ajax_display_letter.php , display detail of a lettering operation
+ */
+//@description: test ajax_display_letter.php
+$_GET=array (
+  'gDossier' => '25',
+  'j_id' => '343',
+  'obj_type' => 'card',
+  'search_start' => '01.01.2019',
+  'search_end' => '31.12.2019',
+  'op' => 'dl',
+);
+$_POST=array (
+);
+$_POST['gDossier']=$gDossierLogInput;
+$_GET['gDossier']=$gDossierLogInput;
+ $_REQUEST=array_merge($_GET,$_POST);
+echo h1('Raw');
+include 'ajax_misc.php';
+
+echo h1('Détail');
+ob_start();
+include 'ajax_misc.php';
+$var=ob_get_contents();
+ob_end_clean();
+
+
+$xml=simplexml_load_string($var);
+
+foreach ($xml as $key=>$value) {
+    echo ("key is $key<br>");
+    echo '<textarea class="w-100" rows="10">';
+    print_r( $value);
+    echo '</textarea>';
+    echo '<hr>';
+    print_r( $value);
+    echo '<hr>';
+
+
+}
\ No newline at end of file
diff --git a/unit-test/create-dossier-test.sh b/unit-test/create-dossier-test.sh
index a609f783b..b3f65e29c 100755
--- a/unit-test/create-dossier-test.sh
+++ b/unit-test/create-dossier-test.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-export PGCLUSTER=12/main
+export PGCLUSTER=17/main
 DOSSIER_TEST=rel91dossier25
 FILE_TEST=dossier25.sql
 
diff --git a/unit-test/include/class/acc_letter.Test.php b/unit-test/include/class/acc_letterTest.php
similarity index 99%
rename from unit-test/include/class/acc_letter.Test.php
rename to unit-test/include/class/acc_letterTest.php
index 410a5a9b1..f6be39006 100644
--- a/unit-test/include/class/acc_letter.Test.php
+++ b/unit-test/include/class/acc_letterTest.php
@@ -33,7 +33,7 @@ use PHPUnit\Framework\TestCase;
  */
 require DIRTEST.'/global.php';
 
-class Acc_Letter extends TestCase
+class Acc_LetterTest extends TestCase
 {
     /**
      * @var Fiche