Reckon creates this error code when trying to enter GST from broker for overseas import. Called Reckon and they cannot help with more than 4 digit error codes. Problem seems to be when you need to enter GST from supplier when GST is higher than net amount. It is higher because you need to pay broker for GST of import. Reckon online does not like this and crashes. Desktop version accepted without a problem. Now spent 2 hours trying to sort out without any luck.