Number of deliverable units per instrument, e.g., peak days in maturity month or number of calendar days in maturity month. The FIX Security Definition (tag 35-MsgType=d) message for the variable quantity spread will be populated with the value '0' for tag 231-ContractMultiplier. The FIX Security Definition (tag 35-MsgType=d) message is populated with values for the outright legs for tag 231-ContractMultiplier and customers must extract this value.

public const int ContractMultiplier = 231