IB symbols for currency pairs

I have opened an account with IB and trying to create forex trading system. I started working with simple demo application
provided by IB.( TestJavaClient). I am able to start and connect and request market data for MSFT(their default symbol).
How can I request market data for currency pair in this sample application? I am sure that everybody who trades forex with IB
automatically at some point in time passed through this step. I am using the following parameters:

Symbol: USD.JPY
Security type: CASH
Expiry:
Strike:
Put / Call
Option Multiplier:
Exchange:Idealpro
Primary Exchange:Idealpro
Currency: USD
Local Symbol:

I always get in response:
3 | 200 | No security definition has been found for the request

Could anybody tell, what correct parameters for forex pair should look like?
 
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