diff --git a/htdocs/hrm/class/position.class.php b/htdocs/hrm/class/position.class.php
index 2401791bb5f..f3cc82f92fe 100644
--- a/htdocs/hrm/class/position.class.php
+++ b/htdocs/hrm/class/position.class.php
@@ -109,7 +109,7 @@ class Position extends CommonObject
 		'date_creation' => array('type'=>'datetime', 'label'=>'DateCreation', 'enabled'=>'1', 'position'=>500, 'notnull'=>1, 'visible'=>-2,),
 		'tms' => array('type'=>'timestamp', 'label'=>'DateModification', 'enabled'=>'1', 'position'=>501, 'notnull'=>0, 'visible'=>-2,),
 		'fk_contrat' => array('type'=>'integer:Contrat:contrat/class/contrat.class.php', 'label'=>'fk_contrat', 'enabled'=>'1', 'position'=>50, 'notnull'=>0, 'visible'=>0,),
-		'fk_user' => array('type'=>'integer:User:user/class/user.class.php', 'label'=>'Employee', 'enabled'=>'1', 'position'=>55, 'notnull'=>0, 'visible'=>1,),
+		'fk_user' => array('type'=>'integer:User:user/class/user.class.php', 'label'=>'Employee', 'enabled'=>'1', 'position'=>55, 'notnull'=>1, 'visible'=>1, 'default'=>0),
 		'fk_job' => array('type'=>'integer:Job:/hrm/class/job.class.php', 'label'=>'Job', 'enabled'=>'1', 'position'=>56, 'notnull'=>1, 'visible'=>1,),
 		'date_start' => array('type'=>'date', 'label'=>'DateStart', 'enabled'=>'1', 'position'=>51, 'notnull'=>1, 'visible'=>1,),
 		'date_end' => array('type'=>'date', 'label'=>'DateEnd', 'enabled'=>'1', 'position'=>52, 'notnull'=>0, 'visible'=>1,),
@@ -842,7 +842,80 @@ class Position extends CommonObject
 		return dolGetStatus($this->labelStatus[$status], $this->labelStatusShort[$status], '', $statusType, $mode);
 	}
 
-	/**
+    /**
+     * Return HTML string to put an input field into a page
+     * Code very similar with showInputField of extra fields
+     *
+     * @param  array   		$val	       Array of properties for field to show
+     * @param  string  		$key           Key of attribute
+     * @param  string  		$value         Preselected value to show (for date type it must be in timestamp format, for amount or price it must be a php numeric value)
+     * @param  string  		$moreparam     To add more parameters on html input tag
+     * @param  string  		$keysuffix     Prefix string to add into name and id of field (can be used to avoid duplicate names)
+     * @param  string  		$keyprefix     Suffix string to add into name and id of field (can be used to avoid duplicate names)
+     * @param  string|int	$morecss       Value for css to define style/length of field. May also be a numeric.
+     * @return string
+     */
+    public function showInputField($val, $key, $value, $moreparam = '', $keysuffix = '', $keyprefix = '', $morecss = 0, $nonewbutton = 0)
+    {
+        global $langs;
+
+        if($key == 'fk_user')
+        {
+            $vacantId = $keyprefix.$key.'vacant'.$keysuffix;
+
+            $out = parent::showInputField($val, $key, $value, $moreparam, $keysuffix, $keyprefix, $morecss);
+            $out.= '<label class="nowrap position-fk-user classfortooltip" title="'.dol_escape_js($langs->trans('VacantCheckboxHelper')).'"><input type="checkbox" id="'.$vacantId.'" name="'.$vacantId.'" />&nbsp;' . $langs->trans("Vacant") . '</label>';
+
+            ?>
+            <script type="text/javascript">
+                $(document).ready(function() {
+                    var checkbox = $('#<?php print $vacantId; ?>')
+                    var searchfkuser = $('#<?php print $keyprefix.$key.$keysuffix; ?>')
+                    checkbox.click(function () {
+                        if (checkbox.prop('checked')) {
+                            searchfkuser.val(0).trigger('change');
+                            searchfkuser.prop('disabled', 1);
+                        } else {
+                            searchfkuser.prop('disabled', 0);
+                        }
+                    })
+                })
+            </script>
+            <?php
+        }
+        else{
+            $out = parent::showInputField($val, $key, $value, $moreparam, $keysuffix, $keyprefix, $morecss);
+        }
+
+        return $out;
+    }
+
+    /**
+     * Return HTML string to show a field into a page
+     * Code very similar with showOutputField of extra fields
+     *
+     * @param  array   $val		       Array of properties of field to show
+     * @param  string  $key            Key of attribute
+     * @param  string  $value          Preselected value to show (for date type it must be in timestamp format, for amount or price it must be a php numeric value)
+     * @param  string  $moreparam      To add more parametes on html input tag
+     * @param  string  $keysuffix      Prefix string to add into name and id of field (can be used to avoid duplicate names)
+     * @param  string  $keyprefix      Suffix string to add into name and id of field (can be used to avoid duplicate names)
+     * @param  mixed   $morecss        Value for css to define size. May also be a numeric.
+     * @return string
+     */
+    public function showOutputField($val, $key, $value, $moreparam = '', $keysuffix = '', $keyprefix = '', $morecss = '')
+    {
+        global $langs;
+
+        if($key == 'fk_user' && $this->fk_user == 0)
+        {
+            return $langs->trans("VacantPosition");
+        }
+        return parent::showOutputField($val, $key, $value, $moreparam, $keysuffix, $keyprefix, $morecss);
+    }
+
+
+        /**
 	 *    Load the info information in the object
 	 *
 	 * @param int $id Id of object
diff --git a/htdocs/hrm/position_list.php b/htdocs/hrm/position_list.php
index d6ed72c2612..0e0f561ebb2 100644
--- a/htdocs/hrm/position_list.php
+++ b/htdocs/hrm/position_list.php
@@ -270,6 +270,10 @@ foreach ($search as $key => $val) {
 		}
 	}
 }
+$vacant = GETPOST('vacant', 'alphanohtml') === 'on';
+if($vacant) {
+    $sql .= ' AND t.fk_user = 0';
+}
 if ($search_all) {
 	$sql .= natural_search(array_keys($fieldstosearchall), $search_all);
 }
diff --git a/htdocs/langs/fr_FR/hrm.lang b/htdocs/langs/fr_FR/hrm.lang
index d47596fe95e..fd0bddcc2eb 100644
--- a/htdocs/langs/fr_FR/hrm.lang
+++ b/htdocs/langs/fr_FR/hrm.lang
@@ -79,3 +79,5 @@ NoEval=Aucune évaluation effectuée pour cet employé
 HowManyUserWithThisMaxNote=Nombre d'employés avec ce niveau
 HighestRank=Plus haut niveau
 SkillComparison=Comparaison des compétences
+VacantPosition=Poste vacant
+VacantCheckboxHelper=Cocher cette option affichera le(s) poste(s) comme non pourvu(s)