CyberSource rejects orders from certain amount ranges with code 203

Question

I'm having a problem with CyberSource (test environment).
The thing is that I'm sending Auth requests for orders with total amounts >=$1000.
Auth reply comes as:

[ccAuthReply] => stdClass Object
(
     [reasonCode] => 203
     [avsCode] => 1
     [processorResponse] => 303 //sometimes with 100 code
)

I've made successful transactions with amounts < $1000 and >=$12 000 , which is odd.

Answer 1

From Cybersource:

The CyberSource test environment is set to return errors for order totals between $1000 and $5000. This is intentional to allow users to become familiar with the reply messages returned for various errors and develop error handling methods for the errors generated.