diff --git a/app/functions/fn.promotions.php b/app/functions/fn.promotions.php
index f1d63d6..6f06298 100644
--- a/app/functions/fn.promotions.php
+++ b/app/functions/fn.promotions.php
@@ -482,7 +482,7 @@ function fn_promotion_apply_cart_rule($bonus, &$cart, &$auth, &$cart_products)
 
     } elseif ($bonus['bonus'] == 'give_coupon') {
         $cart['promotions'][$bonus['promotion_id']]['bonuses'][$bonus_id]['pending'] = true;
-        $cart['promotions'][$bonus['promotion_id']]['bonuses'][$bonus_id]['coupon_code'] = fn_promotion_generate_bonus_coupon($bonus, $bonus_id, $cart);
+        $cart['promotions'][$bonus['promotion_id']]['bonuses'][$bonus_id]['coupon_code'] = fn_generate_code('', COUPON_CODE_LENGTH);
 
     } elseif ($bonus['bonus'] == 'free_shipping') {
 
@@ -1693,6 +1693,8 @@ function fn_promotions_calculate_order_discount($bonus, $bonus_id, $cart)
     $price = $cart['subtotal'];
     $value = $bonus['discount_value'];
 
+    static $parent_orders = array();
+
     // this calculations are actual only for the fixed (absolute) amount
     if ($type == 'to_fixed' || $type == 'by_fixed') {
 
@@ -1708,12 +1710,20 @@ function fn_promotions_calculate_order_discount($bonus, $bonus_id, $cart)
             $session_orders_discount['parent_order_discount'] = $discount;
             $session_orders_discount['suborders_discount'] = 0;
 
-        } else { // this is sub order
-            $parent_order = fn_promotion_get_order($cart['parent_order_id']);
+        } else {
+            // this is sub order
+
+            $parent_order_id = $cart['parent_order_id'];
 
-            if (!empty($parent_order['subtotal'])) {
+            // get parent order subtotal info
+            if (!isset($parent_orders[$parent_order_id]['subtotal'])) {
+                $parent_order_info = fn_get_order_info($parent_order_id);
+                $parent_orders[$parent_order_id]['subtotal'] = $parent_order_info['subtotal'];
+            }
+
+            if (!empty($parent_orders[$parent_order_id]['subtotal'])) {
                 // calculate the share of the full discount
-                $value = $value * $price / $parent_order['subtotal'];
+                $value = $value * $price / $parent_orders[$parent_order_id]['subtotal'];
             }
 
             $discount = fn_promotions_calculate_discount($type, $price, $value);
@@ -1896,46 +1906,3 @@ function fn_promotion_shippings($this, $cart)
 
     return $result;
 }
-
-
-/**
- * Return order data. Result saved in internal cache.
- *
- * @param int $order_id
- * @return array|bool
- */
-function fn_promotion_get_order($order_id)
-{
-    static $orders = array();
-
-    if (empty($order_id)) {
-        return false;
-    }
-
-    if (!isset($orders[$order_id])) {
-        $orders[$order_id] = fn_get_order_info($order_id);
-    }
-
-    return !empty($orders[$order_id]) ? $orders[$order_id] : false;
-}
-
-/**
- * Generate bonus coupon for order
- *
- * @param array $bonus Array with promotion data
- * @param int $bonus_id Bonus ID
- * @param array $cart Array with cart data
- * @return string Coupon code
- */
-function fn_promotion_generate_bonus_coupon($bonus, $bonus_id, $cart)
-{
-    if (!empty($cart['parent_order_id'])) {
-        $parent_order = fn_promotion_get_order($cart['parent_order_id']);
-
-        if (!empty($parent_order['promotions'][$bonus['promotion_id']]['bonuses'][$bonus_id]['coupon_code'])) {
-            return $parent_order['promotions'][$bonus['promotion_id']]['bonuses'][$bonus_id]['coupon_code'];
-        }
-    }
-
-    return fn_generate_code('', COUPON_CODE_LENGTH);
-}