diff --git a/koha-tmpl/intranet-tmpl/prog/en/includes/validator-strings.inc b/koha-tmpl/intranet-tmpl/prog/en/includes/validator-strings.inc
index 0600f0a672..87dde3e610 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/validator-strings.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/validator-strings.inc
@@ -11,6 +11,7 @@
             number: _("Please enter a valid number."),
             digits: _("Please enter only digits."),
             equalTo: _("Please enter the same value again."),
+            number: _("Please add amount in valid format: 0.00"),
             maxlength: $.validator.format(_("Please enter no more than {0} characters.")),
             minlength: $.validator.format(_("Please enter at least {0} characters.")),
             rangelength: $.validator.format(_("Please enter a value between {0} and {1} characters long.")),
diff --git a/koha-tmpl/intranet-tmpl/prog/js/staff-global.js b/koha-tmpl/intranet-tmpl/prog/js/staff-global.js
index 0e16baf053..abb3193bd7 100644
--- a/koha-tmpl/intranet-tmpl/prog/js/staff-global.js
+++ b/koha-tmpl/intranet-tmpl/prog/js/staff-global.js
@@ -110,6 +110,9 @@ $(document).ready(function() {
     $(".validated").each(function() {
         $(this).validate();
     });
+    jQuery.validator.addClassRules("decimal", {
+        number: true
+    });
 
     $("#logout").on("click",function(){
         logOut();