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AHS
In order to trade Options on Futures, the OptionOrder.Symbol attribute must be set to the opt_underlier of the security. A list of these is attached to this post.
Example:
RediLib.OPTIONORDER objOrder = new RediLib.OPTIONORDER();
objOrder.Symbol = 'R.ON-.EUR';
objOrder.Type = 'Call';
objOrder.Date = 'May 25 '18';
objOrder.Strike='2.20';