diff --git a/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm b/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm
index 014ef9937a..00d3b636a5 100644
--- a/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm
+++ b/lib/NGCP/Panel/Form/Balance/CustomerBalanceAPI.pm
@@ -37,6 +37,7 @@ has_field 'free_time_spent' => (
 has_field 'ratio' => (
     type => 'Float',
     required => 0,
+    readonly => 1,
     #precision => 6,
     #decimal_symbol => '.',
     element_attr => {