diff --git a/htdocs/core/modules/holiday/mod_holiday_immaculate.php b/htdocs/core/modules/holiday/mod_holiday_immaculate.php
new file mode 100644
index 00000000000..1355ba90302
--- /dev/null
+++ b/htdocs/core/modules/holiday/mod_holiday_immaculate.php
@@ -0,0 +1,132 @@
+<?php
+/* Copyright (C) 2011      Juanjo Menent	    <jmenent@2byte.es>
+ * Copyright (C) 2018      Charlene Benke		<charlie@patas-monkey.com>
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ * or see http://www.gnu.org/
+ */
+
+/**
+ *  \file       htdocs/core/modules/holiday/mod_holiday_immaculate.php
+ *  \ingroup    contract
+ *  \brief      File of class to manage contract numbering rules Magre
+ */
+
+require_once DOL_DOCUMENT_ROOT .'/core/modules/holiday/modules_holiday.php';
+
+/**
+ *	Class to manage contract numbering rules Magre
+ */
+class mod_holiday_immaculate extends ModelNumRefHolidays
+{
+	var $version='dolibarr';
+	var $error = '';
+	var $nom = 'Immaculate';
+	var $code_auto=1;
+
+	/**
+	 *	Return default description of numbering model
+	 *
+	 *	@return     string      text description
+	 */
+	function info()
+    {
+    	global $conf,$langs;
+
+		$langs->load("bills");
+
+		$form = new Form($this->db);
+
+		$texte = $langs->trans('GenericNumRefModelDesc')."<br>\n";
+		$texte.= '<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
+		$texte.= '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
+		$texte.= '<input type="hidden" name="action" value="updateMask">';
+		$texte.= '<input type="hidden" name="maskconstcontract" value="HOLIDAY_IMMACULATE_MASK">';
+		$texte.= '<table class="nobordernopadding" width="100%">';
+
+		$tooltip=$langs->trans("GenericMaskCodes",$langs->transnoentities("Holiday"),$langs->transnoentities("Holiday"));
+		$tooltip.=$langs->trans("GenericMaskCodes2");
+		$tooltip.=$langs->trans("GenericMaskCodes3");
+		$tooltip.=$langs->trans("GenericMaskCodes4a",$langs->transnoentities("Holiday"),$langs->transnoentities("Holiday"));
+		$tooltip.=$langs->trans("GenericMaskCodes5");
+
+		$texte.= '<tr><td>'.$langs->trans("Mask").':</td>';
+		$texte.= '<td align="right">'.$form->textwithpicto('<input type="text" class="flat" size="24" name="maskholiday" value="'.$conf->global->HOLIDAY_IMMACULATE_MASK.'">',$tooltip,1,1).'</td>';
+		$texte.= '<td align="left" rowspan="2">&nbsp; <input type="submit" class="button" value="'.$langs->trans("Modify").'" name="Button"></td>';
+		$texte.= '</tr>';
+		$texte.= '</table>';
+		$texte.= '</form>';
+
+		return $texte;
+    }
+
+	/**
+	 *	Return numbering example
+	 *
+	 *	@return     string      Example
+	 */
+    function getExample()
+    {
+     	global $conf,$langs,$user;
+
+    	$old_login=$user->login;
+    	$user->login='UUUUUUU';
+     	$numExample = $this->getNextValue($user, '');
+		$user->login=$old_login;
+
+		if (! $numExample)
+		{
+			$numExample = $langs->trans('NotConfigured');
+		}
+		return $numExample;
+    }
+
+	/**
+	 *	Return next value
+	 *
+	 *	@param	Societe		$user     	user object
+	 *	@param	Object		$holiday	holiday object
+	 *	@return string      			Value if OK, 0 if KO
+	 */
+    function getNextValue($user, $holiday)
+    {
+		global $db,$conf;
+
+		require_once DOL_DOCUMENT_ROOT .'/core/lib/functions2.lib.php';
+
+		$mask=$conf->global->HOLIDAY_IMMACULATE_MASK;
+
+		if (! $mask)
+		{
+			$this->error='NotConfigured';
+			return 0;
+		}
+
+		$numFinal=get_next_value($db,$mask,'holiday','ref','', $user, $holiday->date_create);
+
+		return  $numFinal;
+	}
+
+	/**
+	 *	Return next value
+	 *
+	 *	@param	Societe		$objsoc     third party object
+	 *	@param	Object		$objforref	contract object
+	 *	@return string      			Value if OK, 0 if KO
+	 */
+    function holiday_get_num($user, $objforref)
+    {
+        return $this->getNextValue($user, $objforref);
+    }
+}