diff --git a/eopayment/systempayv2.py b/eopayment/systempayv2.py
index 49ff6fb..91a56b9 100644
--- a/eopayment/systempayv2.py
+++ b/eopayment/systempayv2.py
@@ -284,9 +284,15 @@ class Payment(PaymentCommon):
                  'vads_order_info2', 'vads_order_info3',
                  'vads_payment_cards', 'vads_payment_config', 'capture_day'):
         parameter = PARAMETER_MAP[name]
+
+        def check_value(parameter):
+            def validate(value):
+                return parameter.check_value(value)
+            return validate
+
         x = {'name': name,
              'caption': parameter.description or name,
-             'validation': lambda value: parameter.check_value(value),
+             'validation': check_value(parameter),
              'default': parameter.default,
              'required': parameter.needed,
              'help_text': parameter.help_text,