diff --git a/classes/CartRule.php b/classes/CartRule.php
index bb6967a98..2b8d32f09 100644
--- a/classes/CartRule.php
+++ b/classes/CartRule.php
@@ -97,7 +97,7 @@ class CartRuleCore extends ObjectModel
 			'product_restriction' => 	array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
 			'shop_restriction' => 		array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
 			'free_shipping' => 			array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
-			'reduction_percent' => 		array('type' => self::TYPE_FLOAT, 'validate' => 'isFloat'),
+			'reduction_percent' => 		array('type' => self::TYPE_FLOAT, 'validate' => 'isPercentage'),
 			'reduction_amount' => 		array('type' => self::TYPE_FLOAT, 'validate' => 'isFloat'),
 			'reduction_tax' => 			array('type' => self::TYPE_BOOL, 'validate' => 'isBool'),
 			'reduction_currency' => 	array('type' => self::TYPE_INT, 'validate' => 'isUnsignedId'),
diff --git a/classes/Referrer.php b/classes/Referrer.php
index 3bdb67e6c..b1bcf4c09 100644
--- a/classes/Referrer.php
+++ b/classes/Referrer.php
@@ -64,7 +64,7 @@ class ReferrerCore extends ObjectModel
 			'http_referer_like_not' => 		array('type' => self::TYPE_STRING, 'validate' => 'isCleanHtml'),
 			'request_uri_like_not' => 		array('type' => self::TYPE_STRING, 'validate' => 'isCleanHtml'),
 			'base_fee' => 					array('type' => self::TYPE_FLOAT, 'validate' => 'isFloat'),
-			'percent_fee' => 				array('type' => self::TYPE_FLOAT, 'validate' => 'isFloat'),
+			'percent_fee' => 				array('type' => self::TYPE_FLOAT, 'validate' => 'isPercentage'),
 			'click_fee' => 					array('type' => self::TYPE_FLOAT, 'validate' => 'isFloat'),
 			'date_add' => 					array('type' => self::TYPE_DATE, 'validate' => 'isDate'),
 		),
diff --git a/classes/Risk.php b/classes/Risk.php
index f8cb58d94..d5d740692 100644
--- a/classes/Risk.php
+++ b/classes/Risk.php
@@ -42,7 +42,7 @@ class RiskCore extends ObjectModel
 		'fields' => array(
 			'name' => array('type' => self::TYPE_STRING, 'lang' => true, 'validate' => 'isString', 'required' => true, 'size' => 20),
 			'color' =>  array('type' => self::TYPE_STRING, 'validate' => 'isColor', 'size' => 32),
-			'percent' => array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt')
+			'percent' => array('type' => self::TYPE_INT, 'validate' => 'isPercentage')
 		),
 	);
 
diff --git a/classes/Validate.php b/classes/Validate.php
index 049be4ef6..665e1afae 100644
--- a/classes/Validate.php
+++ b/classes/Validate.php
@@ -622,7 +622,7 @@ class ValidateCore
 	/**
 	 * Check for an integer validity
 	 *
-	 * @param integer $id Integer to validate
+	 * @param integer $value Integer to validate
 	 * @return boolean Validity is ok or not
 	 */
 	public static function isInt($value)
@@ -633,13 +633,24 @@ class ValidateCore
 	/**
 	 * Check for an integer validity (unsigned)
 	 *
-	 * @param integer $id Integer to validate
+	 * @param integer $value Integer to validate
 	 * @return boolean Validity is ok or not
 	 */
 	public static function isUnsignedInt($value)
 	{
 		return (preg_match('#^[0-9]+$#', (string)$value) && $value < 4294967296 && $value >= 0);
 	}
+	
+	/**
+	 * Check for an percentage validity (between 0 and 100)
+	 *
+	 * @param float $value Float to validate
+	 * @return boolean Validity is ok or not
+	 */
+	public static function isPercentage($value)
+	{
+		return (Validate::isFloat($value) && $value >= 0 && $value <= 100);
+	}
 
 	/**
 	 * Check for an integer validity (unsigned)