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 87dde3e610..578b51da82 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/validator-strings.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/validator-strings.inc
@@ -12,6 +12,7 @@
             digits: _("Please enter only digits."),
             equalTo: _("Please enter the same value again."),
             number: _("Please add amount in valid format: 0.00"),
+            decimal_rate: $.validator.addMethod("decimal_rate", $.validator.methods.number, "Please add rate 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/en/modules/acqui/supplier.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/supplier.tt
index 1504dda47f..091faad509 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/supplier.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/acqui/supplier.tt
@@ -358,7 +358,7 @@
                 <input type="hidden" name="tax_rate" value="0" />
             [% END %]
             <li><label for="discount">Discount: </label>
-                <input type="text" size="6" id="discount" name="discount" value="[% discount | format ('%.1f') %]" />%</li>
+                <input class="rate" type="text" size="6" id="discount" name="discount" value="[% discount | format ('%.1f') %]" />%</li>
             <li>
                 <label for="deliverytime">Delivery time: </label>
                 <input type="text" size="2" id="deliverytime" name="deliverytime" value="[% deliverytime | html %]" /> days
diff --git a/koha-tmpl/intranet-tmpl/prog/js/staff-global.js b/koha-tmpl/intranet-tmpl/prog/js/staff-global.js
index 0fbedbff84..3899a17edb 100644
--- a/koha-tmpl/intranet-tmpl/prog/js/staff-global.js
+++ b/koha-tmpl/intranet-tmpl/prog/js/staff-global.js
@@ -139,6 +139,10 @@ $(document).ready(function () {
         number: true,
     });
 
+    jQuery.validator.addClassRules("rate", {
+        decimal_rate: true
+    });
+
     $("#logout").on("click", function () {
         logOut();
     });