[Quickfix-developers] Adding Custom Fields to NewOrderSingle message (FIX4.2)

[Nick V. <ni...@ad...>]

I'm using QuickFIX 1.11.0 for Java and have a question related to adding 
custom fields to the FIX4.2 NewOrderSingle message, to enable me to send 
multi-leg orders to my counterparty.  These fields exist in FIX4.4.

Repeating Group Name    Field Number
NoLegs                  555

Repeating Group Member  Field Number
LegSymbol                       600
LegCFICode                      608
LegMaturityMonthYear            610
LegRatioQty                     623
LegSide                 624

Do I simply need to add these fields to the Data Dictionary in order to be 
able to send NewOrderSingle messages with, or without, these new fields? 
Or do I need to modify the QuickFix code in some way?  I guess I'm after 
the safest way to be able to send messages that may or may not have these 
fields defined during a particular fix session with our counterparty.

Thanks.

Nik
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