Insert here the set of "Nested Parties" (firm identification "nested" within additional repeating group) fields defined in
"Common Components of Application Messages"
Used for NestedPartyRole=Leg Clearing Firm/Account, Leg Account/Account Type
LegOptionRatio is provided on Covering leg to create a delta neutral spread. In Listed Derivatives, LegDelta LegOptionRatio
is multiplied by LegOptionRatio and OrderQty to determine the covering quantity