diff --git a/app/Models/Sale.php b/app/Models/Sale.php
index c62cd9c15..74112cdf0 100644
--- a/app/Models/Sale.php
+++ b/app/Models/Sale.php
@@ -1095,12 +1095,12 @@ class Sale extends Model
                     SUM(CASE WHEN payments.cash_adjustment = 1 THEN payments.payment_amount ELSE 0 END) AS sale_cash_adjustment,
                     SUM(payments.cash_refund) AS sale_cash_refund,
                     GROUP_CONCAT(CONCAT(payments.payment_type, " ", (payments.payment_amount - payments.cash_refund)) SEPARATOR ", ") AS payment_type,
-                    payments.reference_code AS reference_code
+                    GROUP_CONCAT(payments.reference_code SEPARATOR ", ") AS reference_code
                 FROM ' . $this->db->prefixTable('sales_payments') . ' AS payments
                 INNER JOIN ' . $this->db->prefixTable('sales') . ' AS sales
                     ON sales.sale_id = payments.sale_id
                 WHERE ' . $where . '
-                GROUP BY payments.sale_id, payments.reference_code
+                GROUP BY payments.sale_id
             )';
 
         $this->db->query($sql);