diff --git a/bundles/EcommerceFrameworkBundle/PricingManager/Action/CartDiscount.php b/bundles/EcommerceFrameworkBundle/PricingManager/Action/CartDiscount.php
index 079747eb6af..5ca9ba07917 100644
--- a/bundles/EcommerceFrameworkBundle/PricingManager/Action/CartDiscount.php
+++ b/bundles/EcommerceFrameworkBundle/PricingManager/Action/CartDiscount.php
@@ -91,9 +91,17 @@ public function fromJSON($string)
     {
         $json = json_decode($string);
         if ($json->amount) {
+            if($json->amount < 0) {
+                throw new \Exception('Only positive numbers and 0 are valid values for absolute discounts');
+            }
+
             $this->setAmount($json->amount);
         }
         if ($json->percent) {
+            if($json->percent < 0) {
+                throw new \Exception('Only positive numbers and 0 are valid values for % discounts');
+            }
+
             $this->setPercent($json->percent);
         }
 
diff --git a/bundles/EcommerceFrameworkBundle/PricingManager/Action/ProductDiscount.php b/bundles/EcommerceFrameworkBundle/PricingManager/Action/ProductDiscount.php
index e9c2faca6e6..75237eab63e 100644
--- a/bundles/EcommerceFrameworkBundle/PricingManager/Action/ProductDiscount.php
+++ b/bundles/EcommerceFrameworkBundle/PricingManager/Action/ProductDiscount.php
@@ -75,9 +75,17 @@ public function fromJSON($string)
     {
         $json = json_decode($string);
         if ($json->amount) {
+            if($json->amount < 0) {
+                throw new \Exception('Only positive numbers and 0 are valid values for absolute discounts');
+            }
+
             $this->setAmount($json->amount);
         }
         if ($json->percent) {
+            if($json->percent < 0) {
+                throw new \Exception('Only positive numbers and 0 are valid values for % discounts');
+            }
+
             $this->setPercent($json->percent);
         }
 
diff --git a/bundles/EcommerceFrameworkBundle/Resources/public/js/pricing/config/item.js b/bundles/EcommerceFrameworkBundle/Resources/public/js/pricing/config/item.js
index d8d189c7d4c..ccf84a4b2ed 100644
--- a/bundles/EcommerceFrameworkBundle/Resources/public/js/pricing/config/item.js
+++ b/bundles/EcommerceFrameworkBundle/Resources/public/js/pricing/config/item.js
@@ -1408,13 +1408,16 @@ pimcore.bundle.EcommerceFramework.pricing.actions = {
                     fieldLabel: t("bundle_ecommerce_pricing_config_action_cart_discount_amount"),
                     name: "amount",
                     width: 200,
-                    value: data.amount
+                    value: data.amount,
+                    minValue: 0
                 }, {
                     xtype: "numberfield",
                     fieldLabel: t("bundle_ecommerce_pricing_config_action_cart_discount_percent"),
                     name: "percent",
                     width: 200,
-                    value: data.percent
+                    value: data.percent,
+                    maxValue: 100,
+                    minValue: 0
                 }
             ]
         });
@@ -1460,13 +1463,16 @@ pimcore.bundle.EcommerceFramework.pricing.actions = {
                     fieldLabel: t("bundle_ecommerce_pricing_config_action_product_discount_amount"),
                     name: "amount",
                     width: 200,
-                    value: data.amount
+                    value: data.amount,
+                    minValue: 0
                 }, {
                     xtype: "numberfield",
                     fieldLabel: t("bundle_ecommerce_pricing_config_action_product_discount_percent"),
                     name: "percent",
                     width: 200,
-                    value: data.percent
+                    value: data.percent,
+                    maxValue: 100,
+                    minValue: 0
                 }
             ]
         });