diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index cac859c53b5..d70993be51d 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -6521,6 +6521,7 @@ class Form
 			elseif ($addjscombo == 2)
 			{
 				// Add other js lib
+				// TODO external lib multiselect/jquery.multi-select.js must have been loaded to use this multiselect plugin
 				// ...
 				$out .= '$(document).ready(function () {
 							$(\'#'.$htmlname.'\').multiSelect({
diff --git a/htdocs/includes/jquery/plugins/multiselect/jquery.multi-select.js b/htdocs/includes/jquery/plugins/multiselect/jquery.multi-select.js
deleted file mode 100644
index ee62d1f588d..00000000000
--- a/htdocs/includes/jquery/plugins/multiselect/jquery.multi-select.js
+++ /dev/null
@@ -1,360 +0,0 @@
-// jquery.multi-select.js
-// by mySociety
-// https://github.com/mysociety/jquery-multi-select
-
-;(function($) {
-
-  "use strict";
-
-  var pluginName = "multiSelect",
-    defaults = {
-      'containerHTML': '<div class="multi-select-container">',
-      'menuHTML': '<div class="multi-select-menu">',
-      'buttonHTML': '<span class="multi-select-button">',
-      'menuItemsHTML': '<div class="multi-select-menuitems">',
-      'menuItemHTML': '<label class="multi-select-menuitem">',
-      'presetsHTML': '<div class="multi-select-presets">',
-      'activeClass': 'multi-select-container--open',
-      'noneText': '-- Select --',
-      'allText': undefined,
-      'presets': undefined,
-      'positionedMenuClass': 'multi-select-container--positioned',
-      'positionMenuWithin': undefined,
-      'viewportBottomGutter': 20,
-      'menuMinHeight': 200
-    };
-
-  /**
-   * @constructor
-   */
-  function MultiSelect(element, options) {
-    this.element = element;
-    this.$element = $(element);
-    this.settings = $.extend( {}, defaults, options );
-    this._defaults = defaults;
-    this._name = pluginName;
-    this.init();
-  }
-
-  function arraysAreEqual(array1, array2) {
-    if ( array1.length != array2.length ){
-      return false;
-    }
-
-    array1.sort();
-    array2.sort();
-
-    for ( var i = 0; i < array1.length; i++ ){
-      if ( array1[i] !== array2[i] ){
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  $.extend(MultiSelect.prototype, {
-
-    init: function() {
-      this.checkSuitableInput();
-      this.findLabels();
-      this.constructContainer();
-      this.constructButton();
-      this.constructMenu();
-
-      this.setUpBodyClickListener();
-      this.setUpLabelsClickListener();
-
-      this.$element.hide();
-    },
-
-    checkSuitableInput: function(text) {
-      if ( this.$element.is('select[multiple]') === false ) {
-        throw new Error('$.multiSelect only works on <select multiple> elements');
-      }
-    },
-
-    findLabels: function() {
-      this.$labels = $('label[for="' + this.$element.attr('id') + '"]');
-    },
-
-    constructContainer: function() {
-      this.$container = $(this.settings['containerHTML']);
-      this.$element.data('multi-select-container', this.$container);
-      this.$container.insertAfter(this.$element);
-    },
-
-    constructButton: function() {
-      var _this = this;
-      this.$button = $(this.settings['buttonHTML']);
-      this.$button.attr({
-        'role': 'button',
-        'aria-haspopup': 'true',
-        'tabindex': 0,
-        'aria-label': this.$labels.eq(0).text()
-      })
-      .on('keydown.multiselect', function(e) {
-        var key = e.which;
-        var returnKey = 13;
-        var spaceKey = 32;
-        if ((key === returnKey) || (key === spaceKey)) {
-          _this.$button.click();
-        }
-      }).on('click.multiselect', function(e) {
-        _this.menuToggle();
-      })
-      .appendTo(this.$container);
-
-      this.$element.on('change.multiselect', function() {
-        _this.updateButtonContents();
-      });
-
-      this.updateButtonContents();
-    },
-
-    updateButtonContents: function() {
-      var _this = this;
-      var options = [];
-      var selected = [];
-
-      this.$element.children('option').each(function() {
-        var text = /** @type string */ ($(this).text());
-        options.push(text);
-        if ($(this).is(':selected')) {
-          selected.push( $.trim(text) );
-        }
-      });
-
-      this.$button.empty();
-
-      if (selected.length == 0) {
-        this.$button.text( this.settings['noneText'] );
-      } else if ( (selected.length === options.length) && this.settings['allText']) {
-        this.$button.text( this.settings['allText'] );
-      } else {
-        this.$button.text( selected.join(', ') );
-      }
-    },
-
-    constructMenu: function() {
-      var _this = this;
-
-      this.$menu = $(this.settings['menuHTML']);
-      this.$menu.attr({
-        'role': 'menu'
-      }).on('keyup.multiselect', function(e){
-        var key = e.which;
-        var escapeKey = 27;
-        if (key === escapeKey) {
-          _this.menuHide();
-        }
-      })
-      .appendTo(this.$container);
-
-      this.constructMenuItems();
-
-      if ( this.settings['presets'] ) {
-        this.constructPresets();
-      }
-    },
-
-    constructMenuItems: function() {
-      var _this = this;
-
-      this.$menuItems = $(this.settings['menuItemsHTML']);
-      this.$menu.append(this.$menuItems);
-
-      this.$element.on('change.multiselect', function(e, internal) {
-        // Don't need to update the menu items if this
-        // change event was fired by our tickbox handler.
-        if(internal !== true){
-          _this.updateMenuItems();
-        }
-      });
-
-      this.updateMenuItems();
-    },
-
-    updateMenuItems: function() {
-      var _this = this;
-      this.$menuItems.empty();
-
-      this.$element.children('option').each(function(option_index, option) {
-        var $item = _this.constructMenuItem($(option), option_index);
-        _this.$menuItems.append($item);
-      });
-    },
-
-    constructPresets: function() {
-      var _this = this;
-      this.$presets = $(this.settings['presetsHTML']);
-      this.$menu.prepend(this.$presets);
-
-      $.each(this.settings['presets'], function(i, preset){
-        var unique_id = _this.$element.attr('name') + '_preset_' + i;
-        var $item = $(_this.settings['menuItemHTML'])
-          .attr({
-            'for': unique_id,
-            'role': 'menuitem'
-          })
-          .text(' ' + preset.name)
-          .appendTo(_this.$presets);
-
-        var $input = $('<input>')
-          .attr({
-            'type': 'radio',
-            'name': _this.$element.attr('name') + '_presets',
-            'id': unique_id
-          })
-          .prependTo($item);
-
-        $input.on('change.multiselect', function(){
-          _this.$element.val(preset.options);
-          _this.$element.trigger('change');
-        });
-      });
-
-      this.$element.on('change.multiselect', function() {
-        _this.updatePresets();
-      });
-
-      this.updatePresets();
-    },
-
-    updatePresets: function() {
-      var _this = this;
-
-      $.each(this.settings['presets'], function(i, preset){
-        var unique_id = _this.$element.attr('name') + '_preset_' + i;
-        var $input = _this.$presets.find('#' + unique_id);
-
-        if ( arraysAreEqual(preset.options || [], _this.$element.val() || []) ){
-          $input.prop('checked', true);
-        } else {
-          $input.prop('checked', false);
-        }
-      });
-    },
-
-    constructMenuItem: function($option, option_index) {
-      var unique_id = this.$element.attr('name') + '_' + option_index;
-      var $item = $(this.settings['menuItemHTML'])
-        .attr({
-          'for': unique_id,
-          'role': 'menuitem'
-        })
-        .text(' ' + $option.text());
-
-      var $input = $('<input>')
-        .attr({
-          'type': 'checkbox',
-          'id': unique_id,
-          'value': $option.val()
-        })
-        .prependTo($item);
-
-      if ( $option.is(':disabled') ) {
-        $input.attr('disabled', 'disabled');
-      }
-      if ( $option.is(':selected') ) {
-        $input.prop('checked', 'checked');
-      }
-
-      $input.on('change.multiselect', function() {
-        if ($(this).prop('checked')) {
-          $option.prop('selected', true);
-        } else {
-          $option.prop('selected', false);
-        }
-
-        // .prop() on its own doesn't generate a change event.
-        // Other plugins might want to do stuff onChange.
-        $option.trigger('change', [true]);
-      });
-
-      return $item;
-    },
-
-    setUpBodyClickListener: function() {
-      var _this = this;
-
-      // Hide the $menu when you click outside of it.
-      $('html').on('click.multiselect', function(){
-        _this.menuHide();
-      });
-
-      // Stop click events from inside the $button or $menu from
-      // bubbling up to the body and closing the menu!
-      this.$container.on('click.multiselect', function(e){
-        e.stopPropagation();
-      });
-    },
-
-    setUpLabelsClickListener: function() {
-      var _this = this;
-      this.$labels.on('click.multiselect', function(e) {
-        e.preventDefault();
-        e.stopPropagation();
-        _this.menuToggle();
-      });
-    },
-
-    menuShow: function() {
-      $('html').trigger('click.multiselect'); // Close any other open menus
-      this.$container.addClass(this.settings['activeClass']);
-
-      if ( this.settings['positionMenuWithin'] && this.settings['positionMenuWithin'] instanceof $ ) {
-        var menuLeftEdge = this.$menu.offset().left + this.$menu.outerWidth();
-        var withinLeftEdge = this.settings['positionMenuWithin'].offset().left +
-          this.settings['positionMenuWithin'].outerWidth();
-
-        if ( menuLeftEdge > withinLeftEdge ) {
-          this.$menu.css( 'width', (withinLeftEdge - this.$menu.offset().left) );
-          this.$container.addClass(this.settings['positionedMenuClass']);
-        }
-      }
-
-      var menuBottom = this.$menu.offset().top + this.$menu.outerHeight();
-      var viewportBottom = $(window).scrollTop() + $(window).height();
-      if ( menuBottom > viewportBottom - this.settings['viewportBottomGutter'] ) {
-        this.$menu.css({
-          'maxHeight': Math.max(
-            viewportBottom - this.settings['viewportBottomGutter'] - this.$menu.offset().top,
-            this.settings['menuMinHeight']
-          ),
-          'overflow': 'scroll'
-        });
-      } else {
-        this.$menu.css({
-          'maxHeight': '',
-          'overflow': ''
-        });
-      }
-    },
-
-    menuHide: function() {
-      this.$container.removeClass(this.settings['activeClass']);
-      this.$container.removeClass(this.settings['positionedMenuClass']);
-      this.$menu.css('width', 'auto');
-    },
-
-    menuToggle: function() {
-      if ( this.$container.hasClass(this.settings['activeClass']) ) {
-        this.menuHide();
-      } else {
-        this.menuShow();
-      }
-    }
-
-  });
-
-  $.fn[ pluginName ] = function(options) {
-    return this.each(function() {
-      if ( !$.data(this, "plugin_" + pluginName) ) {
-        $.data(this, "plugin_" + pluginName,
-          new MultiSelect(this, options) );
-      }
-    });
-  };
-
-})(jQuery);
diff --git a/htdocs/includes/jquery/plugins/multiselect/jquery.multi-select.min.js b/htdocs/includes/jquery/plugins/multiselect/jquery.multi-select.min.js
deleted file mode 100644
index 015aee2264b..00000000000
--- a/htdocs/includes/jquery/plugins/multiselect/jquery.multi-select.min.js
+++ /dev/null
@@ -1,9 +0,0 @@
-(function(c){function f(b,a){this.b=c(b);this.a=c.extend({},g,a);this.H()}var g={containerHTML:'<div class="multi-select-container">',menuHTML:'<div class="multi-select-menu">',buttonHTML:'<span class="multi-select-button">',menuItemsHTML:'<div class="multi-select-menuitems">',menuItemHTML:'<label class="multi-select-menuitem">',presetsHTML:'<div class="multi-select-presets">',activeClass:"multi-select-container--open",noneText:"-- Select --",allText:void 0,presets:void 0,positionedMenuClass:"multi-select-container--positioned",
-positionMenuWithin:void 0,viewportBottomGutter:20,menuMinHeight:200};c.extend(f.prototype,{H:function(){this.v();this.G();this.A();this.w();this.B();this.J();this.K();this.b.hide()},v:function(){if(!1===this.b.is("select[multiple]"))throw Error("$.multiSelect only works on <select multiple> elements");},G:function(){this.l=c('label[for="'+this.b.attr("id")+'"]')},A:function(){this.f=c(this.a.containerHTML);this.b.data("multi-select-container",this.f);this.f.insertAfter(this.b)},w:function(){var b=
-this;this.g=c(this.a.buttonHTML);this.g.attr({role:"button","aria-haspopup":"true",tabindex:0,"aria-label":this.l.eq(0).text()}).on("keydown.multiselect",function(a){a=a.which;13!==a&&32!==a||b.g.click()}).on("click.multiselect",function(){b.m()}).appendTo(this.f);this.b.on("change.multiselect",function(){b.o()});this.o()},o:function(){var b=[],a=[];this.b.children("option").each(function(){var d=c(this).text();b.push(d);c(this).is(":selected")&&a.push(c.trim(d))});this.g.empty();0==a.length?this.g.text(this.a.noneText):
-a.length===b.length&&this.a.allText?this.g.text(this.a.allText):this.g.text(a.join(", "))},B:function(){var b=this;this.c=c(this.a.menuHTML);this.c.attr({role:"menu"}).on("keyup.multiselect",function(a){27===a.which&&b.j()}).appendTo(this.f);this.D();this.a.presets&&this.F()},D:function(){var b=this;this.h=c(this.a.menuItemsHTML);this.c.append(this.h);this.b.on("change.multiselect",function(a,c){!0!==c&&b.s()});this.s()},s:function(){var b=this;this.h.empty();this.b.children("option").each(function(a,
-d){a=b.C(c(d),a);b.h.append(a)})},F:function(){var b=this;this.i=c(this.a.presetsHTML);this.c.prepend(this.i);c.each(this.a.presets,function(a,d){a=b.b.attr("name")+"_preset_"+a;var h=c(b.a.menuItemHTML).attr({"for":a,role:"menuitem"}).text(" "+d.name).appendTo(b.i);c("<input>").attr({type:"radio",name:b.b.attr("name")+"_presets",id:a}).prependTo(h).on("change.multiselect",function(){b.b.val(d.options);b.b.trigger("change")})});this.b.on("change.multiselect",function(){b.u()});this.u()},u:function(){var b=
-this;c.each(this.a.presets,function(a,c){a=b.b.attr("name")+"_preset_"+a;a=b.i.find("#"+a);a:{c=c.options||[];var d=b.b.val()||[];if(c.length!=d.length)c=!1;else{c.sort();d.sort();for(var e=0;e<c.length;e++)if(c[e]!==d[e]){c=!1;break a}c=!0}}c?a.prop("checked",!0):a.prop("checked",!1)})},C:function(b,a){var d=this.b.attr("name")+"_"+a;a=c(this.a.menuItemHTML).attr({"for":d,role:"menuitem"}).text(" "+b.text());d=c("<input>").attr({type:"checkbox",id:d,value:b.val()}).prependTo(a);b.is(":disabled")&&
-d.attr("disabled","disabled");b.is(":selected")&&d.prop("checked","checked");d.on("change.multiselect",function(){c(this).prop("checked")?b.prop("selected",!0):b.prop("selected",!1);b.trigger("change",[!0])});return a},J:function(){var b=this;c("html").on("click.multiselect",function(){b.j()});this.f.on("click.multiselect",function(a){a.stopPropagation()})},K:function(){var b=this;this.l.on("click.multiselect",function(a){a.preventDefault();a.stopPropagation();b.m()})},I:function(){c("html").trigger("click.multiselect");
-this.f.addClass(this.a.activeClass);if(this.a.positionMenuWithin&&this.a.positionMenuWithin instanceof c){var b=this.c.offset().left+this.c.outerWidth(),a=this.a.positionMenuWithin.offset().left+this.a.positionMenuWithin.outerWidth();b>a&&(this.c.css("width",a-this.c.offset().left),this.f.addClass(this.a.positionedMenuClass))}b=this.c.offset().top+this.c.outerHeight();a=c(window).scrollTop()+c(window).height();b>a-this.a.viewportBottomGutter?this.c.css({maxHeight:Math.max(a-this.a.viewportBottomGutter-
-this.c.offset().top,this.a.menuMinHeight),overflow:"scroll"}):this.c.css({maxHeight:"",overflow:""})},j:function(){this.f.removeClass(this.a.activeClass);this.f.removeClass(this.a.positionedMenuClass);this.c.css("width","auto")},m:function(){this.f.hasClass(this.a.activeClass)?this.j():this.I()}});c.fn.multiSelect=function(b){return this.each(function(){c.data(this,"plugin_multiSelect")||c.data(this,"plugin_multiSelect",new f(this,b))})}})(jQuery);
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 44a61a9ac39..2fe3dbc140a 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1426,10 +1426,6 @@ function top_htmlhead($head, $title = '', $disablejs = 0, $disablehead = 0, $arr
             {
             	$tmpplugin=empty($conf->global->MAIN_USE_JQUERY_MULTISELECT)?constant('REQUIRE_JQUERY_MULTISELECT'):$conf->global->MAIN_USE_JQUERY_MULTISELECT;
             	print '<script src="'.DOL_URL_ROOT.'/includes/jquery/plugins/'.$tmpplugin.'/dist/js/'.$tmpplugin.'.full.min.js'.($ext?'?'.$ext:'').'"></script>'."\n";	// We include full because we need the support of containerCssClass
-            }
-            if (! defined('DISABLE_MULTISELECT'))     // jQuery plugin "mutiselect" to select with checkboxes
-            {
-            	print '<script src="'.DOL_URL_ROOT.'/includes/jquery/plugins/multiselect/jquery.multi-select.js'.($ext?'?'.$ext:'').'"></script>'."\n";
             }
 		}